In investment incremental rate of return analysis, paired alternatives are compared and selection is made:

a. If NPV (benefits) EUAC select the higher cost contender, else if NPV (benefits) < EUAC keep the lower cost present selection.

b. If NPV (benefits) EUAC keep the lower cost present selection, else if NPV (benefits) < EUAC select the higher cost contender.

c. If IRR MARR keep the lower cost present selection, else if IRR < MARR select the higher cost contender.

d. If IRR MARR select the higher cost contender, else if IRR < MARR keep the lower cost present selection.