Can you help me understand

Question 9 Which of the following statements correctly describes the applicability of the Manual of Surveying Instructions with regard to lands that passed from the public domain into private ownership? O a. All lands once in the public domain are under the jurisdiction of the Bureau of Land Management. O b. Lands that have passed from the public domain into private ownership are under the jurisdiction of state law. O c. Many of the states have adopted the principles and rules laid down in the Manual of Surveying Instructions through state court opinions and statute laws O d. Both b and C are true