Hi!, In number 2 the answer is 2, in 3 is 1 and in 2 is 3.
This happens because when you talk in first person (in the case of the verb SER) you use SOY, in second person you use ERES in singular and SON in plural and in third person you use ES in singular and SON in plural. c:
Yo soy.
Tú eres.
Él es.
