PLEASE HELP: The sentence below is a mixed construction. Choose the version of the sentence that corrects the error.

For many professors teaching at a university feel the pressure to "publish or perish."

a) Many professors teaching at a university feel the pressure to "publish or perish.”

b) Concerning many professors teaching at a university feel the pressure to "publish or
perish."

c) Since many professors teaching at a university feel the pressure to "publish or perish."

d) With many professors teaching at a university feel the pressure to "publish or perish."