Answer:
The correct option is D. lands
Step-by-step explanation:
Dominions is commonly defined as a territory of considerable size, ruled by a single sovereign or government. Some other synonymous of this word are dependency, colony, territory, and province, to name a few.
Bearing the above in mind, it could be said that in the sentence "When his DOMINIONS were half depopulated, he summoned to his presence a thousand hale and light-hearted friends from among the knights and dames of his court." the word dominions represents "lands".