Arrange the following words in the sequence in which they occur in a standard English dictionary and then select the correct roman numeral sequence: i. Forehead ii. Forensic iii. Forest iv. Foremost.

Introduction / Context:
This dictionary-order problem gives you four words that share the same first four letters: Forehead, Forensic, Forest and Foremost. You are asked to arrange them as they would appear in an English dictionary and then choose the corresponding roman numeral sequence. Because the words share a long common prefix, solving the problem requires careful comparison of letters from the fifth position onward, which is a typical element of dictionary ordering tasks in reasoning exams.

Given Data / Assumptions:

• Words with labels: i. Forehead, ii. Forensic, iii. Forest, iv. Foremost.
• We assume standard English alphabetical ordering.
• Capitalisation is not relevant; ordering depends purely on letter sequence.
• All four words begin with the letters 'fore', so we must compare subsequent letters.

Concept / Approach:
When words share a common prefix, dictionary order is determined by the first position at which their letters differ. Here, all words start with 'fore', so we look at the fifth letter, then the sixth and so on. It is helpful to write each word out and underline the differing letters to visualise their alphabetical order. The basic rule remains: at the first differing letter, the word whose letter is earlier in the alphabet comes first.

Step-by-Step Solution:
Step 1: Write the words with their first five letters: Forehead (foreh...), Forensic (foren...), Forest (fores...), Foremost (forem...). All share 'fore' and differ at the fifth letter. Step 2: Identify the fifth letters: Forehead has 'h', Forensic has 'n', Forest has 's' and Foremost has 'm'. Step 3: Arrange these fifth letters alphabetically: h, m, n, s. Therefore the order based on the fifth letter is: 'h' first, then 'm', then 'n', then 's'. Step 4: Map this back to the words: Forehead (i) contains 'h' as the fifth letter and so comes first. Foremost (iv) has 'm' as the fifth letter and comes second. Forensic (ii) with 'n' comes third. Forest (iii) with 's' comes last. Step 5: There is no need to compare further letters because the fifth letter already determines a unique ordering. The final dictionary order is: Forehead (i), Foremost (iv), Forensic (ii), Forest (iii). Step 6: This corresponds to the roman numeral sequence i, iv, ii, iii.

Verification / Alternative check:
To verify, list the words in the candidate order and check each adjacent pair. Forehead precedes Foremost because 'foreh' comes before 'forem'. Foremost precedes Forensic because 'forem' comes before 'foren' (m before n). Forensic precedes Forest because 'foren' comes before 'fores' (n before s). All of these comparisons are consistent with alphabetical rules, confirming that i, iv, ii, iii is the correct order.

Why Other Options Are Wrong:
Option iii, ii, iv, i would place Forest before Forehead and Forensic, which contradicts the fact that 's' is later in the alphabet than 'h' and 'n'. Option i, ii, iii, iv suggests the order Forehead, Forensic, Forest, Foremost, ignoring that 'm' in Foremost comes before 'n' and 's'. Option i, iv, iii, ii incorrectly places Forest before Forensic, even though 'n' precedes 's'. Because these alternative sequences conflict with the alphabetical comparison of the fifth letters, they cannot represent the correct dictionary order.

Common Pitfalls:
Test takers sometimes rely too heavily on word familiarity or length, assuming, for example, that Forest must come earlier because it is a common everyday word. Others stop comparing after the shared prefix 'fore' and guess the rest. To avoid these errors, always locate the first letter position at which the words differ and base your decision solely on that difference. Here, focusing on the fifth letter is sufficient to unambiguously determine the correct order.

Final Answer:
Arranged in dictionary order, the words appear as Forehead, Foremost, Forensic and Forest, corresponding to the label sequence i, iv, ii, iii. Therefore i, iv, ii, iii is the correct answer.