--- Try this yellow shirt.

-- -____ . How about the red one?

-- -That's OK.

A．But I don't like the size

B．I like it very much

C．But I don't like the color

D．I'll take it

轻质弹簧原长10cm，在它下面挂一个所受重力为4N的物体处于静止时，弹簧长12cm，则错误的是（　　）

A．该弹簧的劲度系数k=200N/m

B．物体受到的合力大小为4N

C．弹簧受到的拉力大小为4N

D．物体受到的弹力大小为4N