Answer:
c.it was built in just two weeks building such an enormous dome was a technological challenge
Step-by-step explanation:
Filippo Brunelleschi was, a goldsmith, known for his architectural design expertise, born in 1377 in the city of Florence, having studied Roman classical buildings, he was able to put the knowledge into use, when he won the bid for completing the Florence Cathedral Dome in 1419.
With excellent visions and ideas, he was able to complete the construction of the Dome in 1436, after so much invention and innovative ideas, such as creation of hoisting machine, and reduction of the Dome's weight, so as to be structurally feasible.