Question: Which of the following is true regarding the Gregory v. Ashcroft decision? Question options: a) Congress may not enact laws that upset the constitutional balance of federal and state powers. b) A federal law must have a plain statement indicating congressional intent to apply if it could alter the constitutional balance of federal and state powers. c) A federal law must not have a plain statement indicating congressional intent to apply if it could alter the constitutional balance of federal and state powers. d) States do not have to comply with laws that upset the constitutional balance of federal and state powers.