Explanation:

Let’s break this down, quick and clear:

- The Marginal Propensity to Consume (MPC) and the Marginal Propensity to Save (MPS) always add up to 1. That’s basic macro—every extra rupee you get is either spent or saved.

- Take Option 2: 1 - MPC = MPS. That works, because whatever you don’t spend, you save.

- Option 3: 1 - MPS = MPC. Flip the logic—whatever you don’t save, you spend.

- Option 1: MPC ÷ MPS = 1? That only happens if MPC = MPS, which is only true if they’re both 0.5. But the general identity is actually MPC + MPS = 1, not their ratio.

- Option 4: All of these. If we read carefully, only options 2 and 3 are always correct. Option 1 isn't always true.

So, the correct answer is:

Option:2, 1-MPC=MPS

Option:3, 1-MPS=MPC