Answer: c. find Joseph guilty of making a terrorist threat.
Explanation:
A Court would likely find Joseph guilty of making a terrorist act under CRIMINAL RECKLESSNESS which is when a person intentionally puts another at risk of injury even if the person is never injured.
By making this terrorist threat, Joseph could have caused a state of panic that could have been very deadly not to mention the misuse of law enforcement resources.
In light of this, Joseph will likely be found guilty of making a terrorist threat.