(5) Although the exact cause is not known, gastrointestinal problems will result after a pet ingests grapes or raisins.

Choose the BEST revision of sentence (5).


A)
Although the exact cause is not known, gastrointestinal problems result after a pet ingests grapes or raisins.


B)
Although their exact cause is not known, gastrointestinal problems result after a pet ingests grapes or raisins.


C)
Although the exact cause is not known, gastrointestinal problems can result after a pet ingests grapes or raisins.


D)
Although their exact cause is not known, gastrointestinal problems can result after a pet ingests grapes or raisins.