Fill in the Blank. Explain Your Reasoning

Multiple Choice

Fill in the blank. Explain your reasoning.
-Doctor Murphy's salary is currently 9% more than Doctor Carell's salary, so Professor Murphy's salary is ____%of Professor Carell's salary.

A) -9%; Doctor Murphy's salary is -9% of Professor Carell's salary.
B) 109%; Doctor Murphy's salary is 100% of Professor Carell's salary plus another 9%.
C) 91%; Doctor Murphy's salary is 100% of Professor Carell's salary minus 9% of Professor Carell's salary.
D) 9%; Doctor Murphy's salary is 9% of Professor Carell's salary.