I am a mycologist. A person who studied biology major mycology. Mycology is the study of fungi. An expert in fungi's genetic and biochemical makeup, pathogen, and taxonomy. I also study benefits and usage in humans as food and medicine together with the innate danger and poisons.
The answer would be light. Light is needed in plants so that they can do the process of photosynthesis.
The answer is c... good luck
Antibiotics can be used to treat sickness