Correct option is A
Option (a) is the correct meaning of the given idiom "That’s all she wrote."
That’s all she wrote: This idiom means "there is nothing more to be said" or "that's the end of it." It is often used to indicate that a situation or event has reached its conclusion and nothing more can be done or added.
Example: After the final goal was scored in the last minute,
that’s all she wrote for the opposing team’s chances of winning.