Why is Bernini's sculpture of the biblical character, David (above), different from other famous sculptures of David?

a.

The sculpture is made of clay instead of marble.

b.

The sculpture shows David's determination, rather than meekness.

c.

The sculpture shows David as active and ready for battle.

d.

The sculpture is twice the size of any previous sculpture.

I know it was made of marble, so A is incorrect. B and C are incorrect, because the sculpture depicts David naked, which is symbolism of his meekness, so it gives no symbolism to his determination, and he is certainly not ready for battle if he was naked. The sculpture is 17 feet long, which is much larger than any of the other sculptures. So, I would say D is the correct answer.