Substitute the highlighted word segment with most appropriate idiom.
They had to cancel their trip at the last minute due to bad weather.

Correct option is D

The correct substitution of the highlighted words is (d) at the eleventh hour.
Explanation: The phrase at the eleventh hour is an idiom meaning “at the last possible moment; just before a deadline or too late to plan otherwise” (आख़िरी घड़ी में/बिलकुल अंतिम समय पर). It is functionally equivalent to “at the last minute” and works here as an adverbial phrase of time modifying the verb “cancel.” The other options express unrelated ideas (confusion, obedience, nearness).
Grammatical rule used: Idiomatic adverbials of time (e.g., at the last moment / at the eleventh hour) modify the whole action and typically follow the verb clause or come at the end for emphasis.
Example: The company submitted the tender at the eleventh hour .
Information booster: When used attributively before a noun, it is hyphenated: an eleventh-hour decision.