Question:
The traditional rule for polite introductions is to present the younger person to the older, as in "Mr. Tolkien, I would like to introduce my little brother Frodo."
Choices:
A.
is to present
B.
is presenting
C.
is in presenting
D.
is the presentation of
E.
is that of presenting
The sentence is correct as written. It is correct idiomatic usage to state an infinitive after the rule is. You can eliminate (B), (C), (D), and (E) because these answers use other forms of the verb.