Step 1: Concept Definition:
Complementary colors are positioned directly opposite on the color wheel. Their juxtaposition produces maximum contrast and heightened vibrancy.
Step 2: Pair Analysis (RYB Wheel):
(A) Blue & Orange: Directly opposite on the color wheel; a complementary pair.
(B) Red & Green: Directly opposite on the color wheel; a complementary pair.
(C) Green & Yellow: Adjacent on the color wheel; an analogous scheme, not complementary.
(D) Purple & Yellow: Directly opposite on the color wheel; a complementary pair.
Step 3: Conclusion:
Complementary color schemes are represented by (A) Blue & Orange, (B) Red & Green, and (D) Purple & Yellow. The correct selection comprises only (A), (B), and (D).