Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks

ASEAN, the Association of Southeast Asian Nations, is composed of ten member countries in the Southeast Asian region. These countries ___(1)___ Brunei Darussalam, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam. The formation of ASEAN ___(2)___ place on August 8, 1967, with the signing of the Bangkok Declaration. Since then, ASEAN has played a vital role in promoting regional cooperation and integration ___(3)___ its member states.
___(4)___ member country brings its unique cultural ___(5)___, economic strengths, and political perspectives to the ASEAN community. The diversity among the member countries enriches the organization and ___(6)___ a sense of unity and mutual understanding. With a combined population of over 650 million people, ASEAN ___(7)___ a significant portion of the global population.
ASEAN member countries work together to enhance economic cooperation and promote inclusive growth in the region. The organization has established ___(8)___ initiatives, such as the ASEAN Economic Community AEC., ___(9)___ aims to create a single market and production base, facilitate trade and investment, and promote seamless economic integration among member countries. Through these efforts, ASEAN member countries strive to improve the ___(10)___ standards and well-being of their people.