Nosotros nos cepillamos los dientes.
Tu eras la primera persona en la clase ayer.
Yo puedo peinarme antes de cada clase.
That’s your answers
With expressions such as 'es raro que' you need to use the subjunctive form of a verb which is slightly different than the present, indicative form. So, the 'normal' form of ir for third person plural would be van. However, we need the subjunctive form here, which is vayan.
This means that the correct answer is A. Vayan a la escuela los sabados.
The form ven doesn't exist.
It is A, totumo is the smallest volcano in the country.
