For one-dimensional isentropic flow in a diverging passage,if the initial static pressure is $$P_1$$), and the initial Mach numberis $$M_1 (M_1 < 1),$$ then for the downstream flow

A

$$M_2 < M_1 ; P_2 < p_1$$

B

$$M_2 > M_1 ; P_2 > p_1$$

C

$$M_2 < M_1 ; P_2 > p_1$$

D

$$M_2 > M_1 ; P_2 < p_1$$