Which Are Some of the Reasons for Ghiberti's Victory in the Competition

Which are some of the reasons for Ghiberti's victory in the competition of 1401?

A) his relief was less expensive to cast and more monumental than Brunelleschi's
B) his relief was less expensive and more graceful
C) his relief was more expensive, but also more elegant
D) his relief was more monumental, more original, and he had political connections