Question

Observation and experimentation have led scientists to accept a theory about the atom. This theory is called the Atomic Theory. Scientific evidence collected and observed by scientists over time suggests that the atom has a nucleus, containing protons and neutrons, and electrons that surround the nucleus.

What makes this a scientific theory?
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