I am 60% positive that the answer is A. gust of wind but not 100% so hope you get this right :)
On the one hand, a <u>gerund</u> is a verb that acts as a noun, know for the -ing form. On the other hand, an <u>infinitive</u> is the basic form of a verb, that usually follows "to" or another verb form. The revised sentence, including both of these, is:
"To give is one of the best things people can do. Volunteering their time shows what caring people they are."
Just write what you think about it there no wrong or right answer to what you think (make sure to hit the thank u button and mark me as brainlyiest)
