Answer:
Option A, carbon
Step-by-step explanation:
An organic molecule consists of carbon as a elementary atom. Thus, all molecules in which a carbon atom bonds to other atoms such as oxygen, hydrogen, nitrogen, another carbon atom etc. are considered as organic molecule.
For example -
Methane -
Here, carbon atom is bonded to four hydrogen atoms
Methanol -
Here, carbon is attached to three hydrogen atoms and one hydroxyl (OH) ion.
Hence, option A is correct.