设函数f(x)在x=x0处可导,则f'(x0)=( )
A <img width="199" height="45" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222802_5073.jpg" /> B <img width="199" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222803_6324.jpg" /> C <img width="220" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222804_6323.jpg" /> D <img width="257" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222805_7417.jpg" />