It can be inferred that "a passbook savings account" ______.

A．It is rare for Washington, D.C. to have such long rainy days.
B．It has been mining since Sept 26^th for the most of the time.
C．It is favorable to the manufacturers to promote solar equipment.
D．It has helped see the disadvantages of solar energy.

A．solar power plants can hardly avoid polluting their surroundings
B．most people prefer the relatively simple use of fossil fuel
C．the uses of solar energy still cannot go without fossil fuel
D．only several communities entirely consist of solar energy homes