Final answer:
Jewish refugees were prepared for their move to an arid Mediterranean climate through agricultural training in DP camps, enabling them to grow food suited to the new environment.
Step-by-step explanation:
The Jewish refugees relocating from a cold, northern climate to an arid Mediterranean climate were prepared for the move by the DP (displaced persons) camps in a variety of ways. However, the most significant manner in which they were prepared is represented by option d. These camps provided agricultural training so that the refugees could adapt to their new environment and effectively grow food in a climate that was vastly different from what they were previously accustomed to. This was important because agriculture would be a key part of their self-sufficiency in their new homes.
Learning to grow food suited to the Mediterranean climate would help ensure that the refugees could establish a stable food source, vital for their survival and integration. Similar to how some Bedouin groups practice transhumance to manage their herding with small farming, or how European immigrants adjusted to the environmental challenges of the western United States frontier by adapting their housing and subsistence practices, Jewish refugees needed to be equipped with knowledge and skills pertinent to their new home's agriculture and environment.