In below compare the bold part of each sentence with expressions A, B, C, D and E. choose the correct expression which is an improvement upon the bold part.You need not come unless you want to.

• A. You come only when you want to
• B. You come unless you don't want to
• C. No correction required
• D. You don't need to come unless you want to
• E. You needn't come until you don't want to

Answer: (D)