Task: Class Relation Understanding (ontology: Sciences/Biology)

Which of the following classes is one valid superclass of 'regulation of methanophenazine biosynthetic process'?

A. 2'-deoxyribonucleotide biosynthetic process
B. 7-methylguanosine catabolic process
C. C-methyltransferase activity
D. regulation of biosynthetic process

Answer: regulation of biosynthetic process