The correct answer to this open question is the following.
The Native Americans taught the Pilgrims how to farm the complicated lands of Massachusetts and to store food in its new land. The Pilgrims had no idea how to do that. They required the help of the Native American Tribe called the Wampanoag, especially from one Native Indian called Squanto, who spoke English. Coastal soil in the region was poor and Indians taught the Pilgrims how to get the most out of it.
The Wampanoags taught Pilgrims how to grow beans, corn, and squash. It had a special technique because the soil in this region was stony and sandy. The Indians taught them to use special fertilizer for the soil with fish and the ashes of the wood.
Most likely it is B. This is because B adds more food decreasing competition. The others would all increase competition.
