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At that time everyone believed that the earth was    at the centre of the universe. But Copernicus realised that this picture did not agree with astronomical observations. He found out that the Sun was at the centre with all the planets moving  around it. He said that our earth takes a year to travel around the Sun. It revolves once every 24 hours. Copernicus believed that the planets moved around the Sun in perfect circles. Fifty years later, Kepler used the extremely accurate measurements of Tycho Brahe to show that they do not.

Copernicus's belief that the planets moved in perfect circles:

 

A) was self-evidently wrong.

B) was perfectly correct.

C) was based on astronomical observations.

D) was proved wrong on further astronomical observations.

E) None of these