A:________ do you feel today?B:I feel very tired.I was very late last night.

用how,选c
对于what,我们经常是在句子成分有缺失的时候,使用what,例如:
what do you need?need后的宾语缺失,因此用what提问
how一般是问感受,方式
如:how do you get there?(方式)
how do you feel?(感受)
why一般针对原因提问.