Fill in the blank with a suitable preposition.
Leo is scared of driving. He drives _______ a speed of 20km/hr
The preposition ‘at’ is generally used to indicate a speed. Since the given sentence discusses the speed that Leo drives at, option D is correct. Whereas ‘of’ is used to denote belonging and is not used to indicate speed. Thus option A is incorrect. On the other hand, ‘for’ is a preposition of reason that is used to denote why something is done/performed, which is not suitable here. Leo is not driving because of the speed, so 'speed' is not the reason in the sentence. Hence option B is incorrect. Whereas the preposition ‘in’ would be irrelevant here because ‘drive-in’ is used to refer to a place where one doesn’t have to get down from one’s car. The expression is inappropriate in the given sentence because it speaks about the speed at which Leo is driving. Therefore option C is incorrect.