The core concept of the question is to identify the word that means 'not advantageous'. - The correct answer is B. disadvantage, which directly means 'a weakness or a fault'. - Option A, advantage, means the opposite, which is 'a benefit'. - Option C, beneficial, means 'advantageous' or 'helpful'. - Option D, profitable, means 'resulting in a financial gain', which is not directly related to the concept of 'not advantageous'.