I think it's C, I'm pretty sure.
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.
Answer: (translated: What things do you use every day you recycled or not recycled before and what do you recycle now?
)
water bottles, glass, plastic things, and cardboard
Explanation: Because they want you to recycle things you can reuse, well you can reuse plastic, cardboard, and etc.
