Select the most appropriate option to fill in the blank.
Raina is waiting for his sister _____ the bus stop.

Correct option is D

The correct option to fill in the blank is (D) at.

Explanation: The preposition 'at' is used to denote a specific point or location in space. Since 'the bus stop' is a specific point of meeting or waiting, 'at' is the grammatically correct choice.

Example: We will meet you at the entrance of the mall.

Information Booster: 'On' is used for surfaces, 'Of' denotes belonging/origin, and 'From' denotes a starting point. 'At' is specifically for exact addresses or specific points.

So the correct answer is (d)