Please answer the question on the picture

C. Can be made up of a combination of different elements

Explanation:

The definition of a chemical compound is: "A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. Two atoms of the same element bonded in a molecule do not form a chemical compound."

Source: Wikipedia  

Positive Geotrophism is referring to the plant’s angle leading to the roots growing downward into the soil. Negative Geotrophism is referring to the plant’s leaves moving away from the earth, up towards the sun in order to receive substantial sunlight.