Solution:

Investment A

Investment A = $5,000 (1.08)(1.08)(1.08(1.08) = $6,802.44
Investment B = $5,000 (0.92)(1.1333)(1.1333)(1.1333) = $6695.65
Investment C = $5,000 (1.12)(1.04)(1.12)(1.04) = $6783.80