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:

A scientific theory is widely accepted when it has been tested many times by different scientists to ensure its reliability and validity. Publication in scientific journals is not the sole criterion for acceptance, and testing by only one scientist is not sufficient. There is no such thing as approval by an "International Committee of Scientists" as the acceptance of a theory is based on evidence - based testing by the scientific community.

Answer:

C. been tested many times by different scientists.