Step 1: Understanding the Question
The question asks for the correct full form of the acronym UNESCO, which is a well-known specialized agency of the United Nations.
Step 2: Key Formula or Approach
The approach is to correctly expand each part of the acronym.
UN - United Nations
E - Educational
S - Scientific
C - Cultural
O - Organization
Step 3: Detailed Explanation
UNESCO was founded in 1945 to promote international cooperation in education, sciences, and culture as a means to foster peace and security.
Its full name reflects its core mandates: United Nations Educational, Scientific and Cultural Organization.
Step 4: Final Answer
Combining the expanded parts gives "United Nations Educational, Scientific and Cultural Organization." Therefore, Option (A) is the correct answer.