To indicate a completed action
In the sentence Henry’s desire to (graduate) is obvious the correct option is B. infinitive. It is a verb preceeded by the prepositon to that forms the full infinitive.
itn the sentence (Running) is not allowed in the hallways the correcto option is A: gerund. A gerund is a verb form (adding -ing to a verb) that functions as a noun
I would say C, because over the years myths build on how something may have happened