Correct answer only !

question 9 (3.5 points)

the following sentence may have an error in effective writing. choose the best revision for the underlined part. if the underlined portion requires no revision, choose "no improvement or correction is required."

the number of people moving to san francisco are rising every year.
question 9 options:

a. no improvement or correction is required.

b. the number of people moving to san francisco is rising

c. the people, in numbers, moving to san francisco are rising

d. the numbers of people moving to san francisco is rising

e. the people who are moving to san francisco in numbers is rising