Ascientific theory
a) is the scientific community’s best explanation for certain observable facts
b) describes an observed pattern in nature without attempting to explain it
c) is an attempt to explain how or why things happen in the manner observed

A). is the scientific community's best explanation for certain observable facts.

Explanation:

A scientific theory can be define as the proposed explanation for the cause of a natural phenomena or natural event. The explanation by scientific community includes the results of direct observations and scientific experimentation procedures.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.