Question

Fill in the blank with the most appropriate word.
I know he is always ready to back _____ his friends.

• A. of
• B. up
• C. from
• D. by

Answer 1

Answer: (B)

up

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.

The correct answer is option B)up as it indicates help (his friends).

'Of', 'from', and 'by' cannot be used here as they indicate possession, source, and agent respectively.

I know he is always ready to back up his friends.