According to Greenspan, what is essential to the e

单项选择题

Questions 9 to 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question.
Now listen to the news.

According to Greenspan, what is essential to the economic success of a country

A．Improvement in everyday life.
B．Improvement in educational system.
C．Lower wages and more working hours.
D．More experienced workers and technicians.