Multi-choice problem: Choose from the options at the end, and answer how do you do this: To cut a watermelon open without a knife.

Possible answers:
(a). Take a bead and make a small incision in the center of the watermelon and karate chop it in half.;
(b). Take a quarter and make a small incision in the center of the watermelon and karate chop it in half.;
(b).