Answer: Option (4)
Explanation: Mine reclamation must be adopted in order to carry out agricultural activities after mining is over in a particular place. This method helps in regaining the essential ingredients upto some extent, for future cultivation.
This method must be adopted before the mining starts. The surface water as well as the ground water can be prevented from getting contaminated by the mining activities. The area selected for mining should be at an isolated place, away from the human inhabitants.
Thus, the correct answer is option (4).