Which One of the Following Sentences Has a Missing or Unclear

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

A) Enrique and Jaime wanted to ask Juanita out, but he was too afraid.
B) A recent report strongly suggested that people need more minerals in their diets.
C) Both the cat and the dog need a bath, but the cat will have to wait.
D) The cans and the bottles should be recycled, but the cans need to be crushed first.