Which sentence has the most effective syntax?

AChewing a ragged nail and checking her watch, she jiggled her leg up and down.

BAfter checking her watch, she jiggled her leg up and down chewing her nail.

CChecking her watch, her leg jiggling up and down, she chewed a ragged nail.

DHer leg jiggling up and down, she chewed a ragged nail and checked her watch.