When president andrew jackson reputedly said, "john marshall has made his decision, now let him enforce it," what did he mean? a. it was time for chief justice john marshall to become an attorney general. b. the supreme court is unable to enforce its decisions without the aid of the executive branch. c. the federal courts depend on congress to fund the judicial police force. d. president jackson was not going to allow chief justice marshall to serve him a subpoena?

b. The Supreme Court is unable to enforce its decisions without the aid of the executive branch.

President Andrew Jackson chose not to enforce the court's decision.  He told the Cherokee that they would need to operate under the jurisdiction of the state of Georgia or else relocate.  This was a step in the direction of what became the "Trail of Tears," when the Cherokee were removed from Georgia and moved to territory in Oklahoma.

Incidentally, according to the New Georgia Encyclopedia, while Jackson's quote is often reported as, "John Marshall has made his decision; now let him enforce it," his actual words were: "The decision of the Supreme Court has fell stillborn, and they find that it cannot coerce Georgia to yield to its mandate."