Answer:
c
Step-by-step explanation:
Internal rate of return is the discount rate that equates the after-tax cash flows from an investment to the amount invested
The IRR would give conflicting answers in this case because a stream of positive cash flows is followed by negative cash flow
IRR can only be used when a negative cash flow is followed by positive cash flows
In this question there are two negative cash flows in year 0 and year 3