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.
How much longer ______ this book?

Options

A. you are needing
B. will you be needing
C. will you have needed
D. have you needed

Answer

B

Explanation

Future Progressive Tense will you be needing is the right usage.
It shows a polite enquiry.