Shelby Was Recently Found Not Guilty of Strong-Arm Robbery

Shelby was recently found not guilty of strong-arm robbery.  She had a jury trial that ruled in her favor.  Moments after the ruling came down, Shelby turned and looked at the jury and said, "Ha, ha, I am guilty and there is nothing you can do about it now."  The jurors were shocked and wanted to change their verdict.  Shelby laughed all the way home.
Shelby was charged and convicted by a jury in a federal court for violation of federal gun laws.   Which of the following is true?

A) The Incorporation Doctrine means that the federal government must follow state laws and the conviction should be overturned.
B) Shelby can appeal her conviction based on the fundamental fairness clause of the Fourth Amendment.
C) Since Shelby never admitted to the crime, she cannot be tried a second time.
D) The prohibition against double jeopardy applies only to the same crime and the same jurisdiction.