The sixth amendment.
To show evidence about the crime
this is not valid to my question.
"Taking the fifth" or "pleading the fifth" means invoking the protection of the Fifth Amendment to the U.S. Constitution--the one that guarantees us the right not to incriminate ourselves. As a witness on the witness stand in court, you can refuse to answer a question if you think the answer might put you in a bad spot with respect to the law. The Wikipedia article on the Fith Amendment (link below) says this: "The Fifth Amendment protects witnesses from being forced to incriminate themselves. To 'plead the fifth' is a refusal to answer a question because the response could form self incriminating evidence."
Amendment
The Sixth Amendment of the Constitution provides a defendant with the opportunity to confront and cross examine his accusers. In today's courts, there is a question of whether a witness' out of court statements that have been sworn to, violate the Sixth Amendment and turns the evidence into 'hearsay.'
Answer this question… A. The Fourteenth Amendment B. The Thirteenth Amendment C. The Tenth Amendment D. The Fifteenth Amendment E. I'm not sure.
Amendment
Your question is very confused. Amendments are ratified, they do not ratify.
When you testify on your own defense. You have the right not to testify under the 5th amendment. The Fifth Amendment protects witnesses from being forced to incriminate themselves. To "plead the Fifth" or to "take the fifth" is a refusal to answer a question because the response could form self incriminating evidence. http://en.wikipedia.org/wiki/Fifth_Amendment_to_the_United_States_Constitution
Witnesses may (or may not) provide additional evidence relative to the outcome of the case. The legal team on both sides have the right to question any witnesses - to enhance the case for - or against the accused.
If by "amendment", the question means "amendment to the Constitution of the United States", then, no. The War is seen by some to be in contravention of the War Powers Resolution, which is a Law and not a Constitutional Amendment.
The Sixth Amendment of the United States Constitution applies in this scenario. It guarantees the right of the accused in criminal prosecutions to compel witnesses to testify in their favor.