Final answer:
Option B.
People living in the Southeast highlands experience cooler weather compared with those in lowlands due to higher elevations, which typically result in cooler temperatures.
Step-by-step explanation:
Compared with those who live in lowlands, people who live in the Southeast highlands experience cooler weather. Highland areas are generally cooler due to higher elevations.
This is consistent with the fact that temperature typically decreases with altitude, leading to cooler climates in highland regions.
Additionally, highland areas can sometimes offer more challenging conditions for agriculture, and the historical context indicates that certain environmental conditions have triggered migrations in search of better living conditions, such as during the fourteenth century when worsening environmental climate led people to migrate.
As locations higher in altitude often have cooler weather, this can sometimes result in more difficult farming conditions and certainly not in warmer winters, as lowland areas usually have milder weather compared to highlands.