Which of the following is true for a reliable scientific source

As the options for the question not given, lets try to answer this question generally.

Explanation:

A reliable source can be described as an authentic source which proves or declines an action, research etc.

The most reliable source for scientific information is scientific papers. This is because scientific papers are subjected to peer - review and hence been tested and validated. A peer-review can be described as a judgement or test made by a person on other peoples research, both of the people having equal caliber.