According to the passage, scientists havent had any doubt about a palaeontological doctrin

According to the passage, scientists havent had any doubt about a palaeontological doctrine that

A．animal bodies tend to be destroyed by different elements.

B．some corpses of animals turn into preserved rock formation.

C．minerals from underground water form. organic material.

D．the remains of animals are usually covered by sediment.

请帮忙给出正确答案和分析，谢谢！