Arrange the following words in the order in which they occur in a standard English dictionary, and then select the correct numeric code. The words are: 1. Sonorous 2. Sometimes 3. Somber 4. Solution 5. Solve.

Introduction / Context:
This dictionary sequence question involves five words starting with the letters So. You must arrange them in the order they would appear in an English dictionary and then select the correct numeric code representing that order. This type of item tests your care in comparing sequences of letters and understanding of alphabetical ordering rules.

Given Data / Assumptions:

• Words: 1. Sonorous, 2. Sometimes, 3. Somber, 4. Solution, 5. Solve.
• All words start with 'So', but differ from the third letter onward.
• We assume standard English dictionary order.
• We must find the correct code such as 45321.

Concept / Approach:
Words are arranged alphabetically by comparing letters from left to right. When earlier letters are the same, we move one position further. For groups sharing the same initial letters, we may need to compare the third or fourth letters to decide which word comes first. If one word is a prefix of another, the shorter word appears before its longer extension. Here, different third letters make the ordering straightforward once we examine them carefully.

Step-by-Step Solution:
Step 1: Write the words with their first three letters: Solution (Sol...), Solve (Sol...), Somber (Som...), Sometimes (Som...), Sonorous (Son...). Step 2: Compare third letters after 'So': Solution and Solve have 'l', Somber and Sometimes have 'm', Sonorous has 'n'. Alphabetically, l comes before m, and m comes before n. Step 3: So all 'Sol' words come first, then all 'Som' words, and finally the 'Son' word. Thus, Solution and Solve come before Somber and Sometimes, which come before Sonorous. Step 4: Compare Solution and Solve. They match up to 'Sol'. At the fourth letter, both have 'u' and then 't' and 'v' at the next position: in Solution, the next distinguishing letter is 'u' followed by 't', while in Solve, the distinguishing letter is 'v'. Since 'u' is not the first differing letter, we actually compare the letter where they differ: 't' versus 'v'. The letter 't' comes before 'v', so Solution (4) appears before Solve (5). Step 5: Compare Somber and Sometimes. Both begin with 'Som'. Next letters: Somber has 'b' at the fourth position, Sometimes has 'e'. Since b comes before e, Somber (3) comes before Sometimes (2). Step 6: Finally, Sonorous (1) follows all 'Sol' and 'Som' words, because 'n' comes after 'l' and 'm'. The complete order is: 4 (Solution), 5 (Solve), 3 (Somber), 2 (Sometimes), 1 (Sonorous), which is 45321.

Verification / Alternative check:
An efficient verification strategy is to group the words by their first three letters: Sol, Som and Son. You then arrange the groups by these triples and only within each group compare further letters. Sol clearly comes before Som and Son. Inside Sol, Solution precedes Solve based on the first differing letter after the shared prefix. Inside Som, Somber precedes Sometimes for the same reason. This grouping technique confirms the order 4, 5, 3, 2, 1.

Why Other Options Are Wrong:
Option 42513 incorrectly places Somber and Sometimes in the wrong positions relative to each other or to Sonorous. Option 12543 starts the sequence with Sonorous, which is impossible because words starting with Son must come after words starting with Sol and Som. Option 32415 similarly disrupts the grouping of Sol, Som and Son words. Only 45321 matches the logically derived dictionary order.

Common Pitfalls:
Learners sometimes misread Sonorous and place it earlier because the letter sequence can be confused with Somber or Sometimes. Another pitfall is failing to compare beyond the first three letters and assuming that the order of introduction in the list has some significance. Always ignore original listing order and focus only on alphabetical comparison. Writing down just the distinguishing letters can make the process much clearer and less error prone.

Final Answer:
The words in correct dictionary order correspond to the code 45321, so this is the correct answer.