(1) sale looked at the map one more time. (2) she knew that the whole troop was depending on her. (3) sal couldn't decide if the trial was to the east or to the west. (4) the map was confusing. (5) sal was tired. (6) she needed to make a decision.

which of these revisions combines sentences 1 and 2 using a subordinating conjunction

a: since she knew that the whole troop was depending on her, sal looked at the map one more time

b: she knew that the whole troop was depending on her and sal looked at the map one more time

c: sal looked at the map one more time, but she knew that whole troop was depending on her

d: either sal looked at the map one more time, or she knew that the whole troop was depending on her