The correct option is D Buoyant
The correct answer here is Option C) - 'Buoyant'. This is because this word satisfies the rules of proper grammatical convention the best and follows the tense of the sentence as well (in this case, past). The answer is buoyant because in this case, it means to be cheerful and optimistic, which one would be after a series of victories. Buzzing is inappropriate, blatant means something that is obvious and blizzard refers to a storm. Thus all other options are incorrect.