The answer is B. estudiante.
The article preceding it, 'las', is the plural feminine article. 'estudiante' in the sentence is singular only, but it is gender neutral. 'son' is the third person plural conjugation of the verb 'ser'. 'inteligentes' is an adjective that would refer to plural subjects. To fix the sentence, change 'estudiante' to 'estudiantes'.
Anteayer era lunes. (i think it right)
Answer:
Cazaran, esta, empiese, suiguen, son, desarrollan, sabe, habia
Explanation:
1.Para conseguir buenas calificaciones tienes que estudiar
2.Pides Pizza en la Pizzeria
3.Si, yo sigo a barcelona
4.Si no consiguo buenas calificaciones mis padres dicen que estoy castigada
5.Los programas que repiten en la television, son las novelas
I'm not sure of the vocab you're supposed to use, but I think it's: Manuel Carmen, estoy (I am) muy contento por ellos, pero eso (that) es algo enfermo y no puedo ir.
Hope that helps and is somewhat correct!