Three western powers—the united states, france, and the united kingdom—were original members of seato, the southeast asia treaty organization. why would those powers have joined a mutual defense organization in southeast asia?
a) all three nations were asked to become members by weaker asian nations.
b) all three nations wanted to contain the spread of communism in the region.
c)all three nations had established colonies in the region.
d) all three nations wanted land and ports for military bases in the region.