I would use Sont since in a classroom females and males and since it’s a mix of the box and a group of people not counting yourself it would be ils and so using that ils verb is sont
It is B. When you use il to start your sentence, you cannot use A, because that is only used for Ils and Elles, C is only used for nous, and D is only used for Tu.
B. the break-in at the Democratic Party headquarters
Le lundi, il se marche avec son chien : On Monday, he walks with his dog.
