The best way to conserve water at home from the options given is C: use a bucket and sponge to wash a car or a bike. This method helps to control the amount of water used compared to using a hose, which can waste a significant amount of water.
The other options either waste water or are not effective in conserving it:
- A: take shorter showers is a good practice, but it's not listed as one of the options you originally mentioned.
- B: water the garden at midday is generally not recommended, as much of the water evaporates due to heat.
- D: leave the water running while washing dishes wastes a lot of water.
So, C is the best choice for conserving water.