"the geese flying by are headed south for the winter".
identify the present participle in the sentence:
a. by
b. are
c. flying
d. headed

Flying is the present participle in the sentence.

Present participle is the form of a verb, ending in -ing in English, which is used in forming continuous tenses, e.g., in I'm thinking, alone in nonfinite clauses, e.g., in sitting here, I haven't a care in the world, as a noun, e.g., in good thinking, and as an adjective, e.g., in running water.

The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

by explaining that it took the same total time to travel by plane as it did by train