Concept:The correct spelling of the word meaning an occupation or trade is "Business".Explanation:The word "Business" has one 's' after 'u' and ends with 'ness'.Option B "Busyness" means the state of being busy, which is a different word.Option C "Bussiness" has an extra 's' and is incorrect.Option D "Buseness" misses the letter 'i' and is incorrect.Remember: The standard spelling is B-u-s-i-n-e-s-s.Answer:A. Business