Select the correct option to fill blank 2.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. when.
- The most appropriate option to fill is "when." Using "when" implies that yawning occurs in the context of a specific condition—namely, when there is a lack of oxygen.
- This fits the idea that yawning might happen under certain circumstances, such as low oxygen levels, without explicitly stating it as the definitive reason.
- The use of "when" suggests a situational relationship rather than a direct causation.