Read the following passage: "I can't wait to meet some sharks!" he exclaimed. "I just know I'll find the albino whale shark. It's—"

"One of the rarest sharks in the world, we all know!" interrupted Nick. "You've talked about nothing else since we planned this trip weeks ago!"

"Now Nick, be nice to your brother," their dad scolded. "He's excited, and he should be. Seeing a rare creature like the albino whale shark is definitely worth getting excited about."

"I'm excited, too!" their mom said enthusiastically. "I can't wait to see the giant tortoises. Some of them live to be centuries old. Who knows? Maybe one of them actually met Charles Darwin."

What does the author reveal when the mom says, "Maybe one of them actually met Charles Darwin"?

A. Charles Darwin could talk to tortoises.
B. Charles Darwin lived a long time ago.
C. Charles Darwin visited the island recently.
D. Charles Darwin was excited about tortoises.