Which of the phrases given below each sentence should replace the phrase printed in bold type to make the sentence grammatically correct?
$You\, need\, not\, come\, unless\, you\, want\, to.$

• A
  You don't need to come unless you want to
• B
  You come only when you want to
• C
  You come unless you don't want to
• D
  You needn't come until you don't want to