—Hello, Sally. How’s everything going?

— _______.

A．The same to you

B．I can’t agree more

C．Not too bad

D．That’s right

图示杆件横截面面积A=0.0025m²，a=0.15m，b=0.1m，材料的弹性模量E=200GPa，力F=150kN，则杆AC段的伸长量为（）。

A．0.036mm

B．0.018nun

C．0.18mm

D．0.36mm