D is the answer
hope this helped :)
Various steps for preparing pond are described below.
Controlling Harmful Aquatic Plants & Animals. Aquatic weeds consumes almost all the nutrition from water. ...
Eradicating Cannibalistic & Unwanted Fish. ...
Applying Lime. ...
Applying Fertilizer.
I'm pretty sure the answer is D because it seems like the most logical statement that could be made by an explorer.
It’s used in alto and occasionally Soprano
