Answer:
A. Acronyms
Step-by-step explanation:
Acronyms can be words formed by the first letters or groups of letters of words in a set phrase or series of words and pronounced as a separate word.
The part of the question we need to focus on in the question is:
"She creates a catchy phrase in which the first letter of each word and the phrase is also the first letter in order of each of the planets."
Notice how it says "first letter." This means she created an acronym.
Miss Yang created an acronym for the order of the planets so her students could memorize it easier.
I hope this helps!!
- Kay :)