** answer asap andd you dont have to give me a reason of why its correct just give me the correct
some mammals and reptiles survived the cretaceous extinction. why did mammals become widespread and successful during the cenozoic era?

a.
mammals could eat a variety of foods, including plants and meat.

b.
mammals had adaptations that them thrive in cold weather.

c.
mammals could grow very large, much larger than reptiles.

d.
mammals were already diverse and numerous when the cenozoic era began.

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.