A boy，3 years old, who have fever 2 days, repeated four convulsions, drowsiness for half a day. Physical examination showed positive Babinski sign, and laboratory examination：cerebrospinal fluid examination（-）; EEG: diffuse slow wave; MRI abnormal temporal signal . The most likely diagnosis is
选项：

A:Epidemic encephalitis;
B:Enterovirus encephalitis;
C:Reye syndrome;
D:Herpes simplex encephalitis