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'.
El trabaja. Tú trabajas. Nosotros enseñamos. Ellos enseñan. Yo busco. Todos (ellos) buscan.
Can you upload the vocabulary list from that lesson? Then I can write if or you!
Answer:
Es un chef. Su éxito se debe a la creatividad y liderazgo emprendedor
Explanation: