A sentence has been given with a blank to be filled with an appropriate option. Choose the correct alternative.
He was stable _________ they met.

Correct option is D

The correct option to fill in the blank is (d) when.
Explanation: The sentence talks about a condition or state at the time of a particular event. The correct conjunction to refer to a specific time in the past is "when". (Hindi: जब)
Example: She was asleep when he called.
Explanation of incorrect options:
· (a) While – indicates two simultaneous actions but doesn’t fit with “they met”.
· (b) Hence – implies cause-effect (इसलिए) – illogical here.
· (c) Lest – means “for fear that” (कहीं ऐसा न हो कि) – contextually incorrect.