Since 1992, when the board of directors voted to allow
inside salespeople's commissions to be based on how the entire department performs as a whole, several regional offices began setting department goals prohibitively high, with a goal to incite individual competition and prevent against freeloading.
(A) inside salespeople's commissions to be based on how the entire department performs as a whole, several regional offices began
(B) inside salespeople's commissions to be based on the performance of the entire department as a whole, several regional offices began
(C) that the commission of inside salespeople be based on how the entire department performs as a whole, several regional offices have begun
(D) commission of inside salespeople to be based on the performance of the entire department as a whole, several regional offices have begun
(E) that inside salespeople's commissions be based on the performance of the entire department as a whole, several regional offices began