Which two primary colours make orange?

Correct answer: Red and yellow

The governing concept is the formation of secondary colours from pairs of primary colours. Red and yellow combine to make orange, so option A is correct. Yellow plus blue produces green, and blue plus red produces violet. Green is already a secondary colour, not one of the three traditional primary colours used to make orange. Thus only the red-and-yellow pair gives the required result in this school-level colour model.