Which pair is chosen for making a clean green in a split-primary palette?

Correct answer: Cool yellow and greenish blue

For a clean green, both selected primaries should have a greenward bias. Cool yellow commonly leans toward green, and greenish blue also contains a green influence, so option B gives the most direct and saturated green mixture. Option A contains warm yellow and reddish blue, which introduce red or orange influence; C is suited to orange, and D tends toward violet rather than green.