A. most people farm a single crop, and if the crop fails, the economy fails b. the economy is based in many sectors, including services, manufacturing, and agriculture c. mining is the most important industry d. the economy is shifting from an agricultural to an industrial economy

the answer is b (no worries i took the test for it)

Explanation:

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.