65. When the U.S. Congress chooses to act exclusively in an area of the law it is said

a. to dominate the area of the law.

b. to preempt the area of the law.

c. to be exercising its exclusionary authority.

d. to ignore states rights.

66. Commercial speech

a. is completely protected by the First Amendment.

b. is unprotected by the First Amendment.

c. is not protected by the First Amendment as extensively as non-commercial speech.

d. exists only when spoken or written by officers of a corporation.

67. The Establishment Clause of the U.S. Constitution

a. prohibits the creation of a central national bank.

b. created the federal judicial system.

c. was repealed in 1815 at the conclusion of the War of 1812.

d. prohibits showing preference to any religion.

68 A legal precedent

a. is no longer valid 50 years after the case is decided.

b. is no longer valid 100 years after the case is decided.

c. cannot be overruled.

d. remains valid unless and until overruled by a later case or statute.