I'll give you my friend's home adress,___I can be reached mo

I'll give you my friend's home adress,___I can be reached most evenings
A.which B.when C.whom D.where
Which of the tow computer games didi you prefer?
--Actually I didn't like ____
A.both of them B.either of them C.none of them D.neither of them
上面的题选哪个,原因呢,特别是第二个为什么不选A