With R2 and R1 on base, if B2 hits a grounder and it strikes R2 standing on second, what happens?

When R2 is standing on second base and a ground ball hit by B2 strikes R2, the ball is considered dead. According to the rules, a runner is out if a batted ball strikes them while they are standing on a base. Since R2 is in a fixed position on the base and was struck by the live ball, R2 is out as the ball is dead at that moment. This ruling enforces the protection of players on the bases and maintains the flow of the game, ensuring that such instances are addressed promptly by umpires to prevent confusion regarding the status of the play.

The other options do not accurately reflect the rules that govern this situation, as they imply that R2 would remain safe or that the play continues, which contradicts the established rule concerning runners being struck by a batted ball while on a base.