2. 下列何組答案之肌肉群是可協助手部做一打開手( opening hand )的動作?
A. flexor carpi radialis 、extensor indicis 、palmar interossei 、lumbricals
B.abductor pollicis 、flexor pollicis brevis 、opponens digiti minimi 、lumbricals
C. palmaris longus 、extensor pollicis longus 、dorsal interossei 、flexor digitorum superficialis
D. extensor digitorum 、abductor pollicis longus 、extensor pollicis brevis 、extensor digiti minimi