Why Was Building Damage So Extensive in the 1985 Mexico

Why was building damage so extensive in the 1985 Mexico City quake?

A) Much of the city is built on lake silts and former swampland that vibrated with the same 2 second period as, and amplified the incoming surface waves.
B) The epicentre was right in the city.
C) The Richter magnitude was 8.8, and the focus was only 25 km from the city.
D) The steel frame buildings were rigid and lacked the flexibility to withstand lateral swaying during even a moderate magnitude quake.