Which of the following phrases best describes a primate city?
a. a city of chimpanzees and orangutans
b. a city with more than ten million residents
c. a city whose per capita income is among the top ten cities in a country
d. a city that is the largest and most influential in its region

The fourth alternative is correct (D).

The concept of a primate city suggests that it is a disproportionately larger city in regional distribution and in economic importance and cultural influence in a country. That is, the primate city is the city that most represents the imaginary of a country when you think of it. For example, Paris, France. When you think of France, Paris is the strongest reference.

which sentences ? that question is incomplete

i think it is is act2 tell me if it is right