Select the most appropriate option to fill in the blank. Determine the collocation through the sentence.
When the commander gives an order, _______ obedience is expected of the soldiers.

Correct option is D

The correct option to fill in the blank is (d) instant.
"Instant obedience" is a common collocation meaning immediate and unquestioning compliance. (तुरंत आज्ञा पालन)
Example: Military discipline requires instant obedience.
Explain why other options are incorrect:
· (a) fastly – not a valid English adverb
· (b) suddenly – refers to a change in action, not appropriate here
· (c) hurry – noun/verb, grammatically incorrect in this context
�� Information Information Booster: "Instant" is often used in formal instructions or commands: instant reply, instant effect, instant response.