Suppose Projects Mars and Venus Are Mutually Exclusive

Suppose projects Mars and Venus are mutually exclusive.Project Mars has an IRR of 10 percent and project Venus has an IRR of 20 percent.One can then conclude that:

A) project Venus must always be preferred to Mars.
B) project Mars must always be preferred to Venus.
C) project Mars has a negative NPV while project Venus has a positive NPV.
D) it is impossible to rank the two projects without further information about the timing and amounts of the cash flows.