Question

why did president jimmy carter believe that the soviet invasion of afghanistan posed a significant threat?
the soviet invasion began to destabilize the region.
the soviet invasion was likely to expand into neighboring countries.
the soviet invasion undermined the us - led alliance in the region.
the soviet invasion was likely to bring economic ruin to the region.

Explanation:

During the Cold War, President Carter viewed the Soviet invasion of Afghanistan (1979) as a major threat primarily due to the risk of Soviet expansion. The U.S. feared the Soviets would push into neighboring oil-rich Middle Eastern countries, which would threaten Western energy supplies and global power balance. The other options were not the core concern driving Carter's strong reaction.

Answer:

B. The Soviet invasion was likely to expand into neighboring countries.