They went to New Delhi . . . . . . . . bus. A. from B. by C. in D. of

The correct answer is B. by.

The preposition by is used to indicate the means of transportation. In this case, the people went to New Delhi by bus.

The other options are incorrect because they do not make sense in the context of the sentence.

• From is used to indicate the starting point of a journey. In this case, the people did not go to New Delhi from a bus.
• In is used to indicate the location of something. In this case, the people did not go to New Delhi in a bus.
• Of is used to indicate possession or association. In this case, the people did not go to New Delhi of a bus.