Which index should Marvin use as a benchmark when evaluating the performance on his mutual fund ?" Index 1 Index 2 Index 3 Index 4 Beta 0. 56 0. 96 1. 56 0. 75 I - squared 0. 65 0. 83 0 . 74 0. 98 a . Index 1 . b. Index 2 . C . Index 3 . d. Index 4