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

Which of the following definitions best describes 'phosphatidylethanolamine N-methyltransferase activity'?

A. Catalysis of the reaction: S-adenosyl-L-methionine(1+) + myo-inositol = 1D-3-O-methyl-myo-inositol + S-adenosyl-L-homocysteine + H+.
B. Catalysis of the reaction: S-adenosyl-L-methionine + a jasmonate = S-adenosyl-L-homocysteine + a methyljasmonate.
C. Catalysis of the reaction: S-adenosyl-L-methionine + phosphatidylethanolamine = S-adenosyl-L-homocysteine + H+ + phosphatidyl-N-methylethanolamine.
D. Catalysis of the reaction: 10-hydroxydihydrosanguinarine + S-adenosyl-L-methionine(1+) = S-adenosyl-L-homocysteine + dihydrochelirubine + H+.

Answer: Catalysis of the reaction: S-adenosyl-L-methionine + phosphatidylethanolamine = S-adenosyl-L-homocysteine + H+ + phosphatidyl-N-methylethanolamine.