"Suzanne Sommers' newest work$-$out machine, the Gut Buster, ends up hurting all of its buyers. The step$-$by$-$step guide included with the book gives wrong directions, resulting in back injuries for millions of people."

If everyone injured by Gut Busters joins together to sue Sommers, what is this called?

Select one:

a$.$ Proper Plaintiff

b$.$ Class Action

c$.$ Proper Party

d$.$ Proper Deponent