01 Why may secondary colours be used in a poster?
Answer and explanation
Correct answer: A. To increase colour variety and visual appeal
Explanation: Secondary colours are formed by mixing pairs of primary colours: red and yellow make orange, yellow and blue make green, and blue and red make violet. In a poster, these colours can increase variety, visual appeal, emphasis, and balance while supporting the message. Thus option A is correct. Cutting paper, erasing letters, and removing colours are physical or destructive actions, not purposes of using secondary colours.