The less the surface of the ground yields to the weight of the body of a runner,______to the body.

A．the stress it is greater

B．greater is the stress

C．greater stress is

D．the greater the stress

联防队员甲见乙形迹可疑，将其带回办公室吊打讯问，致乙重伤。甲的行为（）。

A、构成刑讯逼供罪

B、构成暴力取证罪

C、构成故意伤害罪

D、构成故意伤害罪，并应从重处罚