Conspicuous means something that is visible or seen or noticeable by the naked eye.
Option A is the correct answer because “prominent” means something that is very noticeable hence it is the correct answer.
Option B is incorrect because “beautiful “ means attractive and pretty, which is not related to the given word.
Option C is incorrect because “colourful” means full of various colours, which is incorrect because it is not related to the given word.
Option D is incorrect because “scented” means something that smells good, which Is not related to the given word hence incorrect.