The revision that is necessary is D. change the comma after "parts"" to a colon.
It should be noted that a revision simply means revising a sentence in order to illustrate it better or make it more meaningful.
In this case, the revision that is necessary is to change the comma after "parts"" to a colon.
Learn more about revision on:
https://brainly.com/question/8823021
#SPJ4