Answer: This means: "d. Your economic profit has gone down and your accounting profit has stayed the same."
Explanation: The difference between the accounting and economic benefit is associated with the type of cost that each includes:
The accounting benefit is nothing more than the difference between income and cost. In this case it is still $50000.
The economic benefit includes not only explicit costs. The economic benefit is the difference between income and total costs (explicit and implicit). Therefore, this benefit is less than the accounting benefit. Because in this case the cost of working at home is considered.