Question

Fill in the blank with a suitable preposition:

Flu and measles are both caused _________ a virus.

• A. By
• B. With
• C. For
• D. On

Answer 1

The correct option is A By

A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words. Option A)by is correct as it is used to express a cause. The other options are wrong as with, for, and on indicate inclusion, a purpose, and a surface respectively. These uses don't fit in the given question. The correct answer is A)by.