HELP ME!!!

Leonardo da Vinci and Michelangelo were both great artists of the Renaissance period. They were also bitter rivals. Why were these men threatened by each other's talent?
Select one:
a. They both needed patronage from the same people--the Medici and the Pope.
b. They were born in different cities--loyalty to a city fueled their rivalry.
c. One man created secular art while the other was strictly a religious artist.
d. One artist was a sculptor while the other was a painter.