The development of the proscenium stage
the production of baroque opera.
hindered
didn't effect
enhanced

enhanced, because it is a raised stage with curtains they could open and close the curtains, it also allowed for an orchestra pit, made more room on the stage, more elaborate scenerty

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).