Which direct object pronoun correctly completes the conversation? fernando: tuve que comprar unas sillas. víctor: ¿dónde compraste? a. los b. la c. las d. lo

When could you attach the direct object pronoun to an infinitive verb? a: when an infinitive verb follows a conjugated verb. b: when an infinitive verb ends in a question. c: when a stem-changing verb ends in a question. d: when a stem-changing verb follows a conjugated verb.