The marginal advantage/profit to you of a usual activity in which you engage tends to: (i) Raise as long as you enjoy the activity. (ii) Eventually reduce as you do more of activity. (iii) Stabilize when the market price of doing the activity stay constant. (iv) Improve your expertise as you follow the activity more conscientiously. (v) Never become negative when it has ever been positive.
Can someone please help me in finding out the accurate answer from the above options.