Which phrase describes a scientific theory? A. A proposed explanation that can be tested B. An observation that leads to a question C. A thoroughly tested and widely accepted explanation D. A description of how elements of nature will behave under certain conditions

C. A thoroughly tested and widely accepted explanation

Explanation:

A scientific theory is a coherent statement or set of ideas that explains observed facts or phenomenon and are thoroughly tested and widely accepted. Scientific theory is the basis of scientific knowledge. It is confirmed by observation and repeated experimentation under controlled conditions according to the scientific method. In scientific disciplines, scientific theory sets out scientific laws and principles of observed and generally accepted facts.

A. A proposed explanation that can be tested

Explanation:

By definition a scientific theory is a proposed explanation that can be tested. Theories need proofs.