Why is the cell theory considered a scientific theory?

a.
it is an explanation that is well supported.
b.
it was formed over 100 years ago.
c.
it has always been proven to be correct.
d.
it was proposed by several scientists

The answer is option A "It is an explanation that is well supported." The cell theory would be considered as a scientific theory because it has a big amount of evidence to help support it. Most theories are based on facts that have been repeatedly experimented and tested including the cell theory which is why the cell theory IS a scientific theory.

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answer; i believe the correct answer is ( proteins );