In the following question, four spellings of the same word are given, out of which only one spelling is correct. Select the correctly spelt word that refers to a bruise or injury caused by a blow.

Introduction / Context:
Spelling questions test your familiarity with standard English orthography, especially for words that are common in medical, legal, or formal contexts. The word here refers to a bruise or injury produced by a blow, usually without a break in the skin. Such vocabulary appears in reports, news articles, and examinations.

Given Data / Assumptions:

• All four options are variations of the same target word.
• The intended meaning is a bruise or injury caused by impact.
• Only one option uses the standard spelling accepted in dictionaries.

Concept / Approach:
The correct word is "contusion." It is derived from Latin and is widely used in medical descriptions. The key points in its spelling are the initial "con," the middle "tu," and the final "sion." Any deviation that changes vowels or consonants at these positions will no longer match the correct word in English. Spelling questions often present slight variations that look similar in order to test careful visual recognition.

Step-by-Step Solution:
Step 1: Recall the standard term for a bruise without a cut: "contusion." Step 2: Check each option against this memory: C o n t u s i o n. Step 3: See that option A, "Contusion," exactly matches this pattern. Step 4: Observe that the other options change either the vowel order or replace letters, which makes them incorrect spellings. Step 5: Select option A as the correctly spelt word.

Verification / Alternative check:
If you look at uses of this word in medical reports or sports injury summaries, you will see sentences such as "The player suffered a contusion on his knee." None of the variant spellings shown in the other options occur in formal writing. This real world verification supports the choice of "Contusion."

Why Other Options Are Wrong:

• Contution: The letters after "t" are incorrect. The correct sequence is "tus," not "tut."
• Cuntusion: The second letter should be "o," not "u," so the beginning "cun" is wrong.
• Cuntution: This option contains two errors at once: "cun" instead of "con" and "tution" instead of "tusion."

Common Pitfalls:
A frequent problem in spelling questions is that test takers read too quickly and pick a word that looks familiar at first glance. Others rely on pronunciation alone, which can be misleading because many English words are not spelled exactly as they sound. Training your eye to notice each letter in sequence is essential for scoring well in spelling based items.

Final Answer:
The correctly spelt word meaning a bruise or injury caused by a blow is Contusion.