The statement which best explains the presence of carbon 14 in organisms is this: THE RADIOACTIVE ISOTOPE REACTS IN THE SAME WAY AS THE STABLE ISOTOPES IN THE CHEMICAL REACTIONS IN THE BODY. The radio active carbon 14 that is found in living organism react in the same way that other carbon isotopes react and does not have any damaging effect on the body.
You would call an 'essay' a serious or witty composition meant to briefly express ideas, views, feelings, or reactions to situations in life. This will make the correct answer C.
