Answer:
B. The cash flow at year 3 is a negative $500.
Explanation:
In case of Investment the cash outflow results.
In years 1, there is a negative cash flow of $300, because $300 is invested which decreased the cash balance.
In case of withdrawal in year 2, there is a positive cash flow of $50.
In years 3, there is a negative cash flow of $500, because $500 is invested which decreased the cash balance.