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

Which of the following classes is one valid superclass of 'biotin--[biotin carboxyl-carrier protein] ligase activity'?

A. (N-acetylneuraminyl)-galactosylglucosylceramide N-acetylgalactosaminyltransferase activity
B. 1-acylglycerophosphocholine O-acyltransferase activity
C. 1,3-beta-D-glucan synthase complex
D. ligase activity, forming carbon-nitrogen bonds

Answer: ligase activity, forming carbon-nitrogen bonds