Which increment should be examined first in incremental rate of return analysis, if MARR = 11.5%?

Which increment should be examined first in incremental rate of return analysis, if MARR = 11.5%? C-A A-C A-B B-A Which increment should be examined first in incremental rate of return analysis, if MARR = 11.5%? C-A A-C A-B B-A