{A} is the only logical answer!! not because of the 8 at evening and 9 in morning but... it says BEFORE being awoked by the alarm... who knows it could be 1 hour or 6 hours.. so you rlly dun know... he never said that they woke up because of the alarm... but how many hours he wouldve gotten before he woke up for any reason!! so you rlly dun have enough info!! o.o get it??
eedddiiitt: mindspank does have another good reason for A too... so yesh yesh! choose whichever one!