Answer:
The correct answer is option d.) the title of the encyclopedia and the page number where the quote appeared.
Step-by-step explanation:
Of all the options given, the best option is D.
It would be much better if you could include more complete information such as an editor's name and the volume of the encyclopedia, but if you do not have this information you can leave it out of your citation.
But it would be best if you at least have the name of the encyclopedia and the page number where the quote comes from.
So we can say that the correct answer is option D.