Answer :
The amendment that was violated when Caleb was not allowed to question the witnesses is the Sixth Amendment.
What does the Sixth Amendment say?
The 6th Amendment posits that a person who is accused of a crime, has the right to confront those who bear witness against them in a criminal case.
This means that Caleb is allowed to confront and question the witnesses who claim to have seen him setting fire to the building.
In conclusion, this is the Sixth Amendment.
Find out more on the Sixth Amendment at https://brainly.com/question/539935.