Which of the Following Was Not a Reason for European

Which of the following was not a reason for European planters to switch to African slave labor?

A) Africans were less likely to die of disease and overwork than Europeans were.
B) Indentured servants became too expensive when land values increased.
C) Rising sugar prices made it possible for planters to pay the high up-front costs of slave labor.
D) The average slave life-span was two to three years longer than the typical indenture contract.
E) All of these were actually reasons for planters to switch.