A mother notices that when she divides brownies equally between her two children and gives each child her share on a separate plate, the brownies last a long time. But when she gives her children a plate to share, the brownies are gone pretty quickly. The mother concludes from this that brownies given on a single plate are:_______.
A) excludable but they might either be rival or nonrival.
B) nonexcludable and nonrival.
C) excludable and rival.
D) excludable and nonrival.
E) nonexcludable and rival.