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'.
That would be the first one Nadan which means to swim
Have a good day
Answer:
¿Por cuanto tiempo trabajaste para ellos?
Trabajé para ellos durante 5 meses.
Answer:
Both of the questions are the 2nd choice.
Explanation: