Answer:
B. A relationship in which one event triggers another.
Answer: resistance to the Soviet blockade of West Berlin
Explanation:
C is the anwere ot the problem
Some historians have called the diffusion of new crops and agricultural methods to the West through Muslim Spain an agricultural revolution because they had a major impact not only on agricultural production but also on incomes, population levels, urban growth, distribution of labor, industrial output, clothing,
C. it was the last escape route from Richmond.