入射光线与镜面的夹角为30°，如图所示若使反射光线与入射光线的夹角为100°，可行的方法是（　　）

A．镜面不动，入射光线远离镜面旋转20°

B．镜面不动，入射光线向镜面旋转20°

C．入射光线不动，镜面逆时针旋转10°

D．入射光线不动，镜面顺时针旋转10°

A circle graph shows how the MegaTech corporation allocates its Research and Development budget: 14% microphotonics; 24% home electronics; 15% food additives; 29% genetically modified microorganisms; 8% industrial lubricants; and the remainder for basic astrophysics. If the arc of each sector of the graph is proportional to the percentage of the budget it represents, how many degrees of the circle are used to represent basic astrophysics research ？（）

A. 8°

B. 10°

C. 18°

D. 36°

E. 52°