Answer:
SEATO sought to provide regional security in Southeast Asia by establishing alliances. ( D )
Step-by-step explanation:
SEATO ( South Asia treaty organization ) was a regional defense organization created from 1955 to 1977, it was founded/formed by the united states, Australia, United kingdom, France , New Zealand , Pakistan, Philippines and Thailand. The purpose of the organization was to prevent communism from gaining ground in the region.
SEATO was able to carry out the containment policy against communism by sough ting to provide regional security in southeast Asia by establishing alliances with other Non Asian countries, although SEATO was a failure in the long run due to internal conflicts.