I’m having trouble with this one

Pronto lupe decidir qué carrera desea estudiar. a. deberán b. deberás c. deberemos d. deberá

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.

Ineed with spanish homework. translation of task: 11. fill out with the correct form of estar or hay 12. fill in fill with the verbs hay, estar and ser.