Which statement from the text of city best shows that the author admires the work of ancient roman city builders?

a."the streets, although busy, were not overcrowded."

b. "because of the efficient organization of farmland and the large numbers of markets and bakeries, food continued to remain in good supply."

c. "by a. d. 100 verbonia's population was almost fifty thousand."

d. "as the demand increased, old thermae, markets, and temples were torn down and replaced by larger, more adequate structures."