【单选题】What was one of the things Pacific Gas and Electric did in the 1989 San Francisco eqrthquake?
A.
Restoring service to its 1.4 million customers within 48 hours.
B.
Writing personal letters of assurance to its 106000 shareholders.
C.
Setting up a hotline for the employees as well as customers.
D.
Running ads in daily newspapers and weekly magazines for as long as 60 days.