All the given practices are appropriate methods for soil conservation in India. Therefore, the correct answer is option 4: 1, 2, 3, and 4.

Explanation:

1. Crop rotation: It is a practice of growing different types of crops in the same area in sequential seasons. Crop rotation helps to maintain soil fertility by alternating the types of crops that are grown, which reduces soil depletion and increases soil nutrient levels.

2. Sand fences: Sand fences are barriers made of vegetation or other materials that are erected perpendicular to the direction of the prevailing wind to reduce soil erosion by wind. They are commonly used in coastal areas to control sand movement.

3. Terracing: It is a method of constructing a series of flat platforms, or terraces, on a slope to create a level surface for cultivation. Terracing reduces soil erosion and conserves water by reducing runoff.

4. Wind breaks: Wind breaks are rows of trees or other vegetation that are planted perpendicular to the direction of the prevailing wind to reduce soil erosion by wind. They are commonly used in dry and arid areas to reduce wind erosion of soil and crops.

All of these practices are appropriate methods for soil conservation in India, where soil erosion and degradation are major environmental concerns.