Assuming the underlined part is 'to see an eagle soar in the air,' the correct answer is C. infinitive.
It's really easy to spot an infinitive - they always have the following form: the word TO + verb. When it comes to participles and gerunds, they look the same - both end in -ing.
I want to say the answer is B.
Hope this helps! :)
The cats we adopted from the animal shelter has orange stripes.
All nouns: Jade, competition, city park. Frisbee is an adjective.