Which best describes the effect of j. j. thomson’s discovery?

The correct answer for the question that is being presented above is this one: "A. The accepted model of the atom was changed." J J Thomson discovered the electrons and performed experiment using the cathode ray tube
Here are the following choices:
A. The accepted model of the atom was changed.
B. The accepted model of the atom was supported.
C. Cathode ray tubes were no longer used in experiments due to poor results.
D. Cathode ray tubes became the only instrument of use in the study of atoms

Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o