Using red and green together generally creates what kind of contrast?

Correct answer: Complementary colour contrast

On the traditional colour wheel, red and green are positioned opposite each other, so they are complementary colours. When used together, their opposition produces strong complementary colour contrast, making option B correct. Size contrast would require large and small forms, texture contrast would require different surface qualities, and line contrast would require differing line characteristics. The relevant difference here is the relationship between the colours.