The member of SEATO (South-East Asia Treaty Organisation) are

The correct answer is D. All of the above.

SEATO (South-East Asia Treaty Organisation) was a collective security organization established in 1954 by the United States, the United Kingdom, France, Australia, New Zealand, Pakistan, the Philippines, Thailand, and the Republic of Vietnam (South Vietnam). The organization’s stated goal was to prevent the spread of communism in Southeast Asia.

SEATO was dissolved in 1977, after the United States withdrew from the organization.