What was the main reason for Public artwork in the Renaissance?

The term public art refers to a specific art genre with its own professional and critical discourse. In the Renaissance, wealthy patrons used art for power. The very act of commissioning an artist to design a building, sculpture, or painting signified the patron’s taste, erudition, financial status, and ambition. The clues found both inside and outside these works offer insight into the hierarchies and values that shaped the warring city-states of 15th and 16th century Italy.

Explanation:

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).