Scientists once believed that protons, electrons, and neutrons were the smallest particles of matter. Now they believe that these particles are made of even smaller particles.Which statement gives one of the reasons the original belief was a theory?
Answer
A
It was not based on tests or observations.
B
It was a factual statement based on a hypothesis.
C
It did not explain what matter is actually made of.
D
It was a widely accepted explanation of the structure of matter.