Olu passed his examination … he was a determined student

Analyze the question: The sentence is "Olu passed his examination __ he was a determined student." We need a conjunction that links the result (passing) to its reason (being determined).

Explain the concept: Conjunctions show different relationships between clauses:

• because gives a reason or cause.
• although shows contrast (something unexpected).
• unless means "if not" and sets a condition.
• when shows time.

Solution, step by step:

1. The first clause is "Olu passed his examination", which is the result.
2. The second clause is "he was a determined student", which explains why he passed.
3. The link is cause and effect, so we need a conjunction of reason.

Testing each option:

• A. "Olu passed his examination although he was a determined student" is illogical. Being determined is not an obstacle to passing, so there is no contrast.
• B. "Olu passed his examination because he was a determined student" makes perfect sense. His determination caused his success.
• C. "…unless he was a determined student" gives a meaningless condition.
• D. "…when he was a determined student" only suggests time and does not give the reason, so it is weaker and less precise.

Answer: The correct option is B. because.

Tip: In conjunction questions, first ask yourself: is the second clause a reason, a contrast, a condition, or a time? Here it is a reason, so "because" is the answer. Remember: although = contrast, unless = condition, when = time, because = reason.