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

Which of the following classes is one valid superclass of 'manganese ion homeostasis'?

A. 1,5-anhydro-D-fructose dehydratase activity
B. monoatomic cation homeostasis
C. 11-O-demethyl-17-O-deacetylvindoline O-methyltransferase activity
D. 1,2-alpha-L-fucosidase activity

Answer: monoatomic cation homeostasis