He bought a new set of … television.

Analyze the question: The sentence is "He bought a new set of __ television." We need the word that correctly fills the gap before the noun "television."

Explain the concept: In English, when a noun is used to describe another noun, it works as a noun adjunct (or compound noun). In this role it stays in the singular form. Examples: "a shoe shop," "a car park," "a colour television."

"Colour television" is the standard fixed expression for a TV that shows images in colour, as opposed to black-and-white television.

Step-by-step solution:

1. The phrase is "a new set of ___ television." The gap needs a word that modifies "television."
2. A. coloured – "coloured television" is not the standard collocation. "Coloured" describes things that have been given colour (coloured pencils), not the type of TV.
3. B. colour – "colour television" is the correct, established compound noun phrase. ✔
4. C. colours – A plural noun adjunct is not used here. "Colours television" is wrong.
5. D. colouring – This means the act of adding colour (a colouring book), so it doesn't fit.

Answer: The correct sentence is "He bought a new set of colour television.

Exam tip: Remember the pattern noun + noun: the first noun describing the second stays singular (colour television, security guard, shoe shop). Also learn fixed collocations like "colour television" and "black-and-white television" because WASSCE often tests them.