Answer:
d. does not require a citation.
Explanation:
if you know it and you put it in your words and didn't quote or paraphrase from a source, you don't need to cite. if you used the information from a source. always cite.
D.
specialize different jobs farm for different crops become artisans and merchants
not helping you because of your profile picture and your a trump supporter so i'm gonna take these free points and dip