HELP!! Which amendment/right best applies to the following scenario?

Kathryn, an eighteen year old college student, is arrested for stealing a classmate’s designer sweater and selling it on eBay. When Kathryn appears before the judge, she asks for a lawyer to help defend her. The judge tells Kathryn she cannot have a lawyer because if she is smart enough to be in college, she knows enough to defend herself.

A) Fourth amendment-no illegal searches or seizures
B) Fifth amendment-cannot be forced to testify against yourself
C) Sixth amendment-the right to an attorney
D) Eighth amendment-the punishment must fit the crime