try to / try ~ing 문제 좀 풀어주세요

A: You seem a little lost. Do you need some help?
B: I’m trying __________ the nearest bus stop in here.
(a) finding
(b) found
(c) to find
(d) to be found
정답이 to find인지 finding인지 헷갈려요.
둘 다 맞는 것 같은데 어떤 차이가 있나요?