Tengo pensado I believe is the answer
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'.
The liver secretes bile, which is a fluid that aids digestion. Along with that is processes digested food molecules.
"La carretera" should be the answer. It is the only one that makes sense.
