What two factors constrained the growth of Mattia Bortoloni's reputation for many years?

A. He was a slow worker and he had limited access to patrons
B. He was a sculptor and his work was often destroyed by natural disasters
C. His work was heavily centered on frescos and some of his work became mis-attributed to others
D. His work was heavily centered on oil paintings and he was a rival of Caravaggio
Answer: 