Answer:
D. decrease in the price of MP3 players
Step-by-step explanation:
The above is the correct answer.
"Ceteris paribus" is a Latin phrase which means "all else being equal". The decrease in the price of MP3 players is the changes that does NOT violate ceteris paribus.
The selected option is talking about MP3 player. The MP3 player doesn't fit into the demand for CD players. It is the odd there which doesn't violate.
Option D is the correct answer.