Because its faster to get and fast to eat on the go. Also because they may be in a hurry
        
             
        
        
        
Okay, an antecedent of a pronoun is always a noun, so immediately you can reject the words late and wandered as incorrect answers, because late is an adjective, and wandered is a verb. This leaves us with two nouns, guests and party. Obviously, the pronoun several refers to the noun guests, so the correct answer is guests - that is the antecedent that corresponds with the pronoun. Several guests, not several parties. 
        
             
        
        
        
What is the question for this?