Answer:
The correct answer is option d) pronoun.
Step-by-step explanation:
A sentence is normally structured with: subject + verb + object. When the verb applies directly to the object responding to the question what? or who? it is called direct object, and when the action it is directed to someone or something and respondes to the questions to who?, to whom? or to what? it is called indirect object. In this case, we can find that the word "la" refers to the direct object because it responds to the question what? And we could prove this by substituting the word "la" for any noun with its article, for instance "la silla" ("the chair").
But this direct object it is expressed with a substitute as it is not mentioned what exactly is but it is only referred by a pronoun. For this reason option b) indirect object and option c) direct option are not correct.
Now, it is not either option a) reflexive pronoun, for they are not used by substituting the noun but for complementing reflexive verbs for the meaning of the sentence.
Rather, we can see that the word "la" corresponds with the direct objects pronoun of the singular third person: yo (me), tú (te), él (lo), ella (la), ellos (los), ellas (las), nosotros (nos). And it goes before the conjugated verb, as the rule establishes, therefore the correct answer is option d) pronoun.