Observation and experimentation have led many scientists to accept a theory about the origin of the universe. This theory is called the Big Bang Theory. Scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. What makes this a scientific theory?

Question

anonymous · Answer

It is built on investigations by many scientists in order to provide a strong and testable explanation. 

 It has been proven by several scientists independently, resulting in its being accepted as truth. 

 It is based on the beliefs and opinions of the majority of the scientific community. 

 It has been proven to be scientific fact through all the experiments and investigations

thomaster · Answer

A theory is a conceptual framework that explains existing observations and predicts new ones. So it has not been proven yet. Therefore we can cancel B and D. 
They're also not based on opinions, only on observations and research. So I thinnk A is the best answer.

anonymous · Answer

Thank you!

thomaster · Answer

you're welcome :)