How did Galileo's work as an astronomer contribute to the acceptance of Copernicus's heliocentric system?

Select one:

a. Galileo's refined telescope made astronomical observations possible, which verified heliocentric.

b. Galileo took the brunt of the Catholic Church's disapproval, making it easier for Copernicus to express his ideas.

c. Galileo was a high-ranking official in the church, and he used his influence to protect Copernicus.

d. Galileo was a popular figure in Renaissance Italy, and he incorporated the Copernican system into his own research.