Multi-choice problem: Based on the sentence "A team in black, the Knights, chases after a member of the unnamed white team who is holding the ball; one Knight and one other white team member is on the ground, while the other members chase the ball-bearer.", is the sentence "People are playing a ball game." a true sentence?

Choices: (a). yes; (b). it is not possible to tell; (c). no;
(a).