Complete the airport check-in attendant's humorous observation by selecting the right phrase.

"The passenger in line three brought _______ suitcases for a simple weekend trip!"

The correct answer is a lot of.

"A lot of" is used in affirmative (positive) sentences to describe a large quantity of something, and it works perfectly with plural countable nouns like "suitcases." "Much" and "little" are used with uncountable nouns, and "a lot" is incorrect here because it is missing the preposition "of" to connect it to the noun.