Which lettered substance best represents an Organic
compound? Explain why you chose
that substance.

Option (a) is the correct answer.

Example:

Enzymes are the substances which are produced by living organisms to carry out various biochemical reactions.

Inside living organisms a lot of chemical reactions occur. With the help of enzymes the speed of these chemical reactions can be controlled.

If there will be no enzymes in the body then the reactions will take place very slowly to keep the organism alive or it will cause a disease in the organism's body. Enzymes also help in the communication of cells, growth of cells etc.

Thus, we can conclude that enzymes are required for living things to function reactions that take place too slowly at body temperature and must be speed up.