Aurora township is asking all of its citizens to chip in and donate money to build a new library. tommy thinks he already pays enough money in taxes, so he chooses not to donate. he knows that even if he does not contribute he will be able to use the library once it is built. This is an example of:
a. Adserve selection
b. The free rider problem
c. Asymmetric information
d. Tragedy of the commons
e. Moral hazard