In the RGB color model, complementary colors are pairs that yield white light when combined. These pairs are diametrically opposed on the color wheel.
Step 1: Blue and Orange are complementary in RGB. Their combination produces white light.
Step 2: Yellow and Purple are complementary on the traditional (subtractive) color wheel, not in the RGB model.
Step 3: Yellow and Orange are not complementary in the RGB model.
Step 4: Blue and Purple are not complementary in the RGB model.
Therefore, the correct answer is (C) Blue and Orange.