The correct answer is:
B. Church of San Lorenzo.
Explanation:
The Medici family paid for the construction of the Church of San Lorenzo, first for the Sacristy and later for the entire Church. The Church was partially designed by Filippo Brunelleschi, and later by Antonio Manetti. The construction lasted from 1419 to 1459. San Lorenzo was the parish church for the Medici family, and it houses the tombs of many members of the family, including Lorenzo the Magnificent.
