Correct option is (c) Lemon grass
Lemongrass leaves are the most commonly found plants found in India. You can use lemongrass oil or can crush the leaves and then applying the oily mixture directly to the skin. Therefore, Correct Answer is "C".
You could also apply some logic that to act as mosquito repellent the grass needs to have an aromatic smell. So Elephant grass could not be the answer and lemongrass may have been the answer.
