单项选择题

A.174.24.96:6088/Latex/latex.action?latex=Zih4KT1cbGVmdFx7XGJlZ2lue2FycmF5fXtjY31lXnsyfSAmeO%2B8nDAgXFwgICBhLWJ4JiB4XGdl%0D%0AMFxlbmR7YXJyYXl9'
B.

C.a=-1,b=-1;
D.a=-1,b=1;

E.a=1,b=-1;