Mis padres caminando en el parque. a. soy c. está b. son d. están select the best answer from the choices provided a b c d

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.