A subsidy on domestic oranges is a positive incentive for domestic producers. The correct option is c.
What is a positive incentive?
Something that stimulates or rewards a specific activity is referred to as a positive incentive.
It's also referred to as inspiration.
For example; eating at a certain restaurant, or shopping at a shop.
Discounts and free samples are positive incentives.
Thus, the correct option is C, a subsidy on domestic oranges
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