<span>sad and disappointed.</span>
Paul celebrated Peter's birthday, then two days later, Peter celebrated Paul's birthday. Because both Peter and Paul are males, we must use the possessive pronoun "his" when speaking of either, or in this case, both of them, which started the confusion represented in this example.
It is because it is very hungry
They are both grammatically correct it is just that the former is using perfact past. As sited from <span>Cambridge Grammar of the English Language "</span>The preterite perfect [i.e. the past perfect] locates the writing anterior to an intermediate time which is anterior to the time of speaking - it is doubly anterior (140). "
B seems to be the correct answer
