Answer:
Method 2 and 3 are correct
Step-by-step explanation:
The method used to conserve water shall comprise of strategies to curb the effect of natural forces that are involved in/ or are responsible for evaporating the water.
Here , in option 2 garden is watered when weather is cool, thus the chances of loss of water by evaporation gets reduced
Like wise in option 3, High winds also lead to wastage of water and hence, watering must be done in pleasant weather when there is no wind.
Hence, Method 2 and 3 are correct