Name two processes that are important in the carbon cycle. Options: a. Photosynthesis and nitrification b. Nitrification and respiration
c. Photosynthesis and respiration d. Nitrification and denitrification

I'm thinking it's A but am unsure.

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.