Which statement is an example of a claim?

a. give up on a goal or dream just because someone tells you it’s impossible.

b. 1903, orville and wilbur wright made the first sustained powered flight in a heavier-than-air machine.

c. a rude remark is like a piece of litter in a national park—the best thing to do is throw it in the garbage where it belongs.

d. people said no one could scale mount everest, but in 1953, sir edmund hilary and tenzing norgay gazed down upon the world from its summit.