Explanation:

- Indifference curve (Option 2): An indifference curve shows various combinations of two products that give the same level of satisfaction to a consumer. It reflects consumer preferences.

- ISO cost curve (Option 1): Shows combinations of goods that can be purchased for a specific budget given prices. It's more about cost rather than satisfaction.

- Marginal utility curve (Option 3): Represents how utility changes with an additional unit of consumption, not combinations of two products.

- ISO quant (Option 4): Represents combinations of inputs that produce the same output in production, not the same satisfaction in consumption.