Which One of the Following Sentences Has a Missing or Unclear

Which one of the following sentences has a missing or unclear antecedent?

A) Either the strawberries or the raspberries would go well with the chocolate, but I suggest you use the strawberries.
B) The government says that the disturbance wasn't caused by UFOs.
C) Nigel and Tim are forever competing against one another, and Nigel usually wins.
D) In the magazine, they say that lime green is the hottest new color.