Question 7.29

According to the definition of a subgame(7.16),
node x defines a subgame only if x forms a singleton information set.

In 7.29 a), it is asked to find a Nash, if this Nash exist then the statement in c) is false. If teh statement in c) is true then we can't find a Nash for the game since the only subgame of the game is the game itself.

Thanks