Many people would not accept the heliocentric theory because

the hypothesis could not explain the apparent celestial motions
the data was not accurate
the treatise claimed the earth was not at the center of the universe
people had come to accept the idea that the earth was the center of the universe

Many people would not accept the heliocentric theory because people had come to accept the idea that the Earth was the center of the universe.

Option D

Explanation:

The heliocentric theory proposed that sun is in the centre, and hence earth is revolving around it. Yes, many people did not accept the beliefs or theories, that the earth is not the centre of the universe, because they had a strong impression in their minds, that the earth is superior to all in the universe, humans being supreme. Those false beliefs made their minds stubborn to any new decisions or theories, regarding the positions of the earth and the sun.