The Supreme Court decision in Planned Parenthood v. Casey (1992) primarily reaffirmed the right to have an abortion established in Roe v. Wade, but it also allowed for certain regulations by the states. The case supported the Tenth Amendment by emphasizing the authority of states to regulate medical procedures, including abortion, as long as those regulations did not place an "undue burden" on a woman's right to choose.
Therefore, the statement that closely aligns with how Casey supports the Tenth Amendment is:
It reserved certain powers for state governments.
The decision acknowledged that while the federal government could not completely prohibit abortion, states had the power to impose certain restrictions within constitutional limits.