William's portfolio earned returns equal to 16%, 9%, -6%, and 14% over the past four years. Given this information, during this 4-year period, William's portfolio earned arithmetic and geometric average returns of: Multiple Choice 11.18%; 7.89% O O 11.18%; 8.25% O 7.89% 8,25% 8.25%: 11.18% 8.25%; 7.89%