In this question, sentence is given with blank to be filled in with an appropriate word. Four alternatives are suggested for question. Choose the correct alternative out of the four.
She is busy __ her work.

Options

A. about
B. with
C. of
D. on

Answer

B

Explanation

busy with something : spending a lot of one.s time fucused on a particular task.
Look at the sentences :
I am so busy with school right now that. I haven.t seen my friends in weeks.
Here, with is the right usage.