Answer: Option (a) is the correct answer.
Step-by-step explanation:
Before experimentation we were not aware of the sub-atomic particles present in an atom. But after the experimentation, we came to know that an atom consists of protons, neutrons and electrons.
After that we came to know that protons and neutrons reside inside the nucleus and electrons revolve around the nucleus of the atom.
Hence, we can conclude that scientific experimentation affected the model of an atom such that the atomic model has become more accurate because of this experimentation.