Read this passage from "the read story behind the discovery of titanic's watery grave"

ballard and his crew erupted with cheers and applause. someone

opened a bottle of champagne for a toast, but the mood suddenly darkened after

they noticed that it was nearly 2: 20 a. m.—the exact time the ocean liner had sunk and

taken more than 1,500 passengers and crew to their deaths. the thought of it hit

ballard like a shock. “we were embarrassed we were celebrating,” he later told 60

minutes. “and all of a sudden we realized that we should not be dancing on

someone’s grave.”

what can you infer about robert ballard's character?

a he was overjoyed.

b he didn't care about the people who died.

c he was mean

d he felt bad because people had died.