Answer:
A) liable, because notice to Emmett is notice to Fridley.
Step-by-step explanation:
A principal is directly responsible for all the contracts and agreements carried out by his/her agent on his/her name. Sometimes even if no express authority exists, implied authority is sufficient for a principal to be liable for the agent's actions.
So Fridley is liable for not paying taxes, but at the same time Emmet is liable to Fridley for not telling him about the taxes that should have been paid. An agent is responsible to the principal for the actions that he/she makes on the principal's behalf.