GMAT Sentence Correction (SC) | Re: Interestingly, a ripe yellow banana appears to glow blue under

Interestingly, a ripe yellow banana appears to glow blue under ultraviolet light,which is likely due to the chlorophyll breakdown that occurs in the peel as the fruit ripens.

A. which is likely due to the chlorophyll breakdown that occurs
B. a phenomenon likely due to the chlorophyll breakdown that occurs
C. because of the chlorophyll breakdown
D. which is likely due to chlorophyll breakdown occurring
E. a phenomenon that is likely because of the chlorophyll breakdownoccurs

I request someone to throe light on the usage of due to here in option. According to theory, Due to only refers to nouns and not actions.