Heartless Indeed
This student’s response was merely pointing out that the two giraffes in the illustration are absolutely horrible for leaving their friend to die, which is pretty sure the correct answer to this question is technically Darwin’s theory of evolution (can a biology expert please confirm or deny this?). However, pretty sure the correct answer to this question is technically Darwin’s theory of evolution.
He’s Right
To tell you the truth, this youngster does have a point. If you ask me, this is a perfectly valid answer because even adults will sometimes (or always) use their fingers to solve simple mathematical equations. If you ask anyone else, they will use their eyes.