What grammatical structure is the italicized portion of the sentence?

Question

By serving as a popcorn vendor, Don saw many good games.

appositive?

Ms. Sue · Answer

No. What is italicized?

Annie · Answer

By serving as a popcorn vendor sorry

Ms. Sue · Answer

What kind of phrase is it?

Annie · Answer

__present participial phrase __nominative absolute __appositive __past participial phrase __prepositional phrase with a gerund

Ms. Sue · Answer

What do you think?

Annie · Answer

not sure but prepositional phrase with a gerund?

random person (dont ask wont tell) :) · Answer

i think it is prepositional phrase with a gerund but that's just me i could be wrong.

Ms. Sue · Answer

Yes. Both of you are correct. It's a prepositional phrase with a gerund. :-)

random person (dont ask wont tell) :) · Answer

thank you Ms. Sue. :):):):):):):):)