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

a. "during the construction of the amphitheater some formwork was accidentally moved before the concrete in the vault had completely set, killing twenty-five slaves, their foreman, and a senator observing the work from the ground."
b. "the two aqueducts still satisfied the city's water needs and the one- hundred-twenty-year-old sewer system was still operating flawlessly."
c. "as verbonia's population steadily climbed, most landlords replaced their small apartment buildings with large apartment blocks."
d. "stables and storerooms around the central courtyard were also rented out."