Which sentence has correct capitalization? A.
The coach said, "let's go out there and try our best!"
B.
The Coach said, "Let's go out there and try our best!"
C.
The Coach said, "let's go out there and try our best!"
D.
The coach said, "Let's go out there and try our best!"

D. "coach" isn't supposed to be capitalized, as it isn't a proper noun (we know that because it says "the" in front. If it was just "coach" and there wasn't a "the", it would be a proper noun and "coach" would have to be capitalized). As it isn't capitalized, we can rule out B and C. "Let's" has to be capitalized because it is dialogue, and is just like the start of another sentence. Thus, the answer is D.