单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.

How many megawatts of electricity were added in 1997

A.45 percent more than was added in 1997.
B.35 percent more than was added in 1997.
C.25 percent more than was added in 1997.
D.15 percent more than was added in 1997.