Mount saint helen is an active stratovolcano and it was formed due to the subduction of the Juan de fuca plate.
I believe your answer is going to be (C)
<span>D.) glockenspiel This is because of the different pitches that follow along with any not of the instrument. Each part has a different pitch, therefore, is not definite. </span>
Answer: Your answers are in the pics below.
Explanation: