The pillage and gift system was particularly useful to nobles in the context of medieval society and feudalism. The correct answer to your question is:
D) They could pay soldiers for their service with land rather than money.
This system allowed nobles to reward their vassals and retainers with land (fiefs) as compensation for military service, which was crucial in an era where cash was often in short supply. This practice helped to maintain loyalty and service among the nobility and ensured the military support necessary for the nobles’ power and protection.