Select the correct option to fill blank 1.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. reason.
- The most appropriate option to fill is "reason" because it directly addresses the cause or explanation for why people yawn.
- The other options, such as "explanation," "basis," and "reality," do not fit as well in this context, where the focus is on identifying the cause or factor behind yawning.