设1＜b＜a，0＜x＜1，则有（　　）

A．x^a＞x^b

B．b^x＞a^x

C．log_ax＞log_bx

D．log_xa＞log_xb

A serious car accident in 1986 __________ a permanent future for him in farming.  [ ]

A. ruled out

B. gave out

C. came out

D. put out