Answer:
1. Yo me ducho el cuerpo
2. Ellas se peinan el pelo
3. Nosotros nos despertamos
4. Bob se lava la cara
5. Tú te cepillas los dientes
The correct answer is A. Hay un profesor con el estudiante.
The sentence says - There is A professor with THE student. In Spanish, the article A is either UN or UNA (depending on the gender) for singular, and UNOS and UNAS for plural. The article THE is either EL or LA, depending on the gender.