Which Inca emperor tried to secure his own release from Spanish captivity with vast quantities of gold?

a. Atahualpa

b. Huascar

c. Las Casas

d. Moctezuma

It was "Atahualpa" who was the Incan emperor who tried to secure his own release from Spanish captivity with vast quantities of gold, since this was the Spanish were most interested in, but he was executed anyway.