Which direct object pronoun correctly completes this conversation?

víctor: tuvimos que comprar unas sillas también.
fernando: compró eduardo.
los
las
lo
la

The correct answer is las.

Explanation:

The direct object is what accompanies the verb and which tells us to whom the action is directed.

The direct object pronoun is used to replace the person or thing that is performing the action of a verb, and is used so that the sentence is not so repetitive and more pleasing to the eye.

Direct object pronouns are written as follows:

Subject                       Singular                 Plural

First person               me                                nos

Second person        te                                 os

Third person            lo, la                             los, las