In contrast to medieval art, paintings during the renaissance were
a. about religious events and concerns
c. mostly commissioned by the church
b. flat and sometimes without background at all
d. realistic and often about everyday life

During the renaissance paitings were C - mostly commissioned by the church. 

During the Renaissance, the Church was a major buyer of paintings from famous painters, artists and sculptures, etc. For this reason, they were also the reason and source of most of the commissions. While painters were increasingly being commissioned by wealthy merchants and traders, the Church was still the main buyer.