Answer:
Recycled Waste water is an important concept for today's time.
Explanation:
Water is quite precious and recycling water for uses other than drinking is referred as Waste water recycling. It is also called reclaimed water.
It is the process of converting waste water into water that could be useful in irrigation, or in agricultural fields. Such water could also be used in replenishing ground water and washing vehicles and so on. Though it is not useful for drinking, it will help in conserving water and can be extensively used.
Thus, this will work as revolutionary idea in today's era when world is dealing with the problems like shortage of water.
I say it is enterprising.
A flashback tells something from the past so the answer would have to be (A) this is because of the use of the word recall. In every other option the verb is present or future tense instead of past tense.
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