Common Acidic Materials Are Often Easier to Recognize Than Bases

Common acidic materials are often easier to recognize than bases just from their chemical formula. Which answer below can explain this fact?

A) Acidic materials typically contain active hydrogen atoms.
B) Acidic materials are often ionic.
C) Acidic materials typically contain halogen atoms.
D) Acidic materials can contain ionic hydroxide groups.
E) all of the above.