According to the textbook, the gas that is thought to be responsible for most of the human- enhanced greenhouse effect, thereby adding to Global Warming, is
O nitrous oxide
methane
carbon dioxide
CFCs

answer: option d.

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.