Help here 50 point a lot

In which of the following sentences is the capitalized word or phrase used or placed incorrectly? a. ¿quién lo conoce á él? b. elena conoce a los dos. c. roberto conoce para maría y por alberto. d. ¿quién conoce a maría?

¡hable más lentamente, por favor! a. his friend b. his parents c. his teacher d. his classmates

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.