The answer is due and dew. Homophones are words that sound the same but are spelled and used differently. Inthis case, doe and act are not the same pronounciation as do.
Answer: D. Save Water
Explanation:
If they did not want to wash plates and switched to paper plates for lunches as well as brought in water from other places, they were trying to save water.
i would go with a but that is based off of only a few books...