Direction: The given sentence contains a blank. Identify the phrase/statement that can make the given sentence grammatically and contextually correct.
Most environmental economics studies the question of how to use ________.
1
the various kinds of incentive both market based and socially based.
2
the various kind of incentives both market based and socially based.
3
the various kinds of incentives both market based or socially based.
4
the various kinds of incentives both market based and socially based.
5
the various kind of incentive both market based nor socially based.