Which phrase does not agree with the verb in the sentence? the was marked down during the sale. jacket and tie package of ties dress suit sweater and skirt set

The answer is: "jacket and tie"

The other answer choices:

"package of ties"; 
"dress suit"; 
"sweater and skirt set"; 

all agree with the verb in the sentence given; because that are in a 'set' or come in a "single unit" and function as a "single noun";

The phrase: "jacket and tie" are not "grouped together" (e.g. in a "single set or kit") and should take the "plural" form of the verb.