Your answer is B.
Because well you could go through process of elimination but you can just look at the answers.
A. James am excited about the trip to Florida.
?? Am? Nope no way that's correct.
B. James is excited about the trip to Florida.
Hmm sounds about right to me!
And C.
James are excited about the trip to Florida.
You may have not noticed but C is A. So cross them both out and you get B.!
Sorry this is like years late.
But i hope this helps you!