The correct answer is D) court-appointed attorneys.
In this case, Clarence Gideon was originally chared with breaking and entering in the state of Florida. When he asked for an attorney, the Florida judge did not approve of it, as he said that attorneys could only be appointed to individuals in capital cases. Gideon argued that this refusal to provide an attorney violated his 6th amendment rights. This case was heard in the Supreme Court. The unanimous court sided with Gideon, upholding his 6th amendment rights.
