Find out whether there is any grammatical error in below sentence. In order to save petrol, / motorists must have to / be very cautious / while driving along the highways.

The correct answer is: E. No error

The sentence is grammatically correct. The word “must” is used to express obligation or necessity. In this sentence, it is used to express the idea that motorists are required to be very cautious while driving along the highways in order to save petrol. The word “cautious” means careful and watchful, and it is appropriate to use this word in this context because motorists need to be careful and watchful when driving in order to avoid accidents. The word “while” is used to introduce a clause that describes the time at which something happens. In this sentence, it is used to introduce a clause that describes the time at which motorists need to be cautious, which is while they are driving along the highways. The word “highways” is a plural noun that refers to roads that are designed for high-speed travel. In this sentence,

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