Because D shells are too big and B shells are too small.
A sheep.
A: A buzzness suit!
He had allure.
Because B-shells are too small, and D-shells are too big.
Because she can't fit into D shells
She grew out of her b-shells
She sells shesells...I mean...Sea sells sea shells...dammit! She's...a beachside entrepreneur."
Because D-shells are too big and B-shells are too small.