Which one i an example of monopoly? a
a businesswoman opens a bookstore in her neighborhood and invites her neighbors to invest in her new store.

b a baker buys up all the sugar in town to make sure that his bakery is the only one that can sell cupcakes.

c
a pilot spends her days off learning how to fly a new type of plane so that she can apply to fly that plane in the future.

d
a hardware store owner is famous for giving the best home improvement advice to his customers.