The correct answer of the given question above would be the last option: PERFORMING AN INVESTIGATION. Since Chou is curious about the effects of magnets on growing plants, she decided to compare it and do a little comparison of the effects by doing an experiment. And performing an investigation is the scientific practice the Chou did.
The decision to nationalize some important industries impacted Britain's economy by B. forcing the government to prop up industries. Because the government started supporting these industries, that led to improvements in economy.
