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

Which of the following classes is one valid superclass of 'heparan-alpha-glucosaminide N-acetyltransferase activity'?

A. N-acetyltransferase activity
B. (S)-6-hydroxynicotine oxidase activity
C. (1->6)-beta-D-glucan metabolic process
D. 2'-deoxyribonucleotide biosynthetic process

Answer: N-acetyltransferase activity