Write the next sentence in this paragraph:

How to play heads down thumbs up
Make sure everyone is seated.
This game is best played in a classroom with desks.
Select seven volunteers.

Available choices:
a). The volunteers must be a certain type of persons, ranging from high school students, to old adults, children and senior citizens. To populate heads down? You must set the positions of the seven volunteers when you place each stat on a desk.;
b). The volunteers should come to the front of the room. Call " heads down, thumbs up.;
c). It can start with only seven volunteers but it can start earlier as everyone should be sitting on them until you are done. Be sure to produce at least three volunteers when you are playing head down.;
d). Two volunteers should be designated for each team. Each volunteer with four thumbs down will lose ten points.;
b).