单选题 One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that______?

A、 new computers had been installed in the buildings.
B、 it occurred in the residential areas rather than on the highways.
C、 large numbers of Los Angeles residents had gone for a holiday.
D、 improvements had been made in the construction of buildings and highways.

【正确答案】 D

【答案解析】根据文章第三段第一至二行排除C，依据文章第三段第三行选D。