To Avoid Rejecting Projects That Actually Should Be Accepted

To avoid rejecting projects that actually should be accepted,
1) intangible benefits should be ignored.
2) conservative estimates of the intangible benefits' value should be incorporated into the NPV calculation.
3) calculate net present value ignoring intangible benefits and then, if the NPV is negative, estimate whether the intangible benefits are worth at least the amount of the negative NPV.

A) 1
B) 2
C) 3
D) both 2 and 3 are correct.