Final answer:
In Illinois, finder's fees are illegal. Agent A's arrangement of offering $100 to former clients for referring leads who buy or sell real estate would be considered a finder's fee.
Step-by-step explanation:
In Illinois, finder's fees are illegal. A finder's fee is a commission or compensation given to a person for finding or referring potential clients or customers. In this case, Agent A is offering his former clients $100 for each lead they send him who ultimately buys or sells real estate. However, this arrangement would be considered a finder's fee, which is prohibited in Illinois law.