In education circles, AP is the abbreviation of:

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A. Associated Proficiency.

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B. Advanced Proficiency.

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C. Associated Placement.

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D. Advanced Placement.

AP is the abbreviation of: D. Advanced Placement.

Explanation:

Advanced Placement is part of the American and Canadian educational systems. It is a group of courses offered to high school students. Taking these courses and later on tests, a high school student can prepare for college, can get a better position when applying for it and even gain some useful credits for the his/her future studies. Students can take preparational classes at school before taking the test, but there are also free to prepare on their own.