The Correct answer is A.

Explanation

Choice (A) is correct. It avoids the errors of the other options by providing the present tense verb "remains" to refer to a present-day statement of fact (Galileo's case is today the most well-known example of scientific suppression) and the past tense verb phrase "was forced" to refer to a past event (in 1633 Galileo was forced to disavow his scientific findings).