Which of the many cultures in the roman empire influenced roman art the most? in what works of art is the influence most apparent?

In picassos masterpeice bulls head which bicycle part makes up the bulls horn

Why did the pilgrimage churches undergo large scale building projects? a. to accommodate the rising number of visitors b. to provide a clearer path for communion c. to appear more like a cross d. none of the above

Why were renaissance artists influenced by ancient greek and roman temples and buildings?