The correct answer is: A) Voting by the Legislative Assembly.
The Legislative Assembly is the body that is responsible for approving the budget proposals. The budget proposals are prepared by the Finance Ministry and are then presented to the Legislative Assembly for approval. The Legislative Assembly can either approve or reject the budget proposals. If the budget proposals are approved, they are then sent to the President for his/her signature. If the budget proposals are rejected, the Finance Ministry has to prepare new budget proposals and present them to the Legislative Assembly again.
B) Presidential decree is not the correct answer because the President does not have the power to approve the budget proposals. The President can only sign the budget proposals after they have been approved by the Legislative Assembly.
C) Supreme Court order is not the correct answer because the Supreme Court does not have the power to approve the budget proposals. The Supreme Court can only review the budget proposals to see if they are constitutional.
D) Public Referendum is not the correct answer because the public does not have the power to approve the budget proposals. The public can only express their views on the budget proposals through their elected representatives in the Legislative Assembly.