Question

from his experiments, j. j. thomson concluded that
cathode ray particles can move at very fast speeds.
cathode ray particles can be moved by electric current.
atoms contain small positively charged particles that are called protons.
atoms contain small negatively charged particles that are called electrons.

Explanation:

J. J. Thomson's cathode ray tube experiments showed that atoms contain small, negatively - charged particles (electrons). The first option about speed was not his main conclusion. The second option about being moved by electric current is not the key conclusion. The third option about protons was not discovered by Thomson (protons were later identified, and Thomson's work was on electrons).

Answer:

D. atoms contain small negatively charged particles that are called electrons. (assuming the options are labeled A, B, C, D with the last option being D; if the original labeling is different, adjust the label but keep the text of the option)