Do you young warrior, hear my age advise
Answer:
to tell the degree at which the stone fell.
I believe it would be to inform, the particular excerpt isn't really informing about anything, and its not persuading the reader to do anything, simply attempting to entertain the reader with a story.
<u>The right answer is</u>
Activists have coined the slogan “toilet to tap” to discourage the use of wastewater.
<u>Explanation</u>
<em>Toilet-to-tap or direct potable reuse is the future of potable water wherever we have acute water shortages but we still have a perception issue to resolve.</em>