Question

before a scientific theory is accepted and supported, it has - a been tested by only one scientist. b been published in scientific journals. c been tested many times by different scientists. d been approved by the international committee of scientists.

Explanation:

For a scientific theory to be accepted, it must undergo extensive testing. Multiple independent tests by different scientists help verify its validity and reliability. One - scientist testing (A) is not sufficient. Publication in journals (B) doesn't guarantee acceptance. There is no single international committee for approval (D).

Answer:

C. been tested many times by different scientists.