The factors that help South Asian economy continue to expand may include ______.

A．the weather in South Asia is too variable to benefit the crops
B．the industrial sector is more important than agriculture in South Asia
C．agriculture contributes a lot to the expansion of regional economy
D．the high growth of this region is mainly propelled by the service sector

A．the annual growth rate of economy is always keeping at 7.2 percent
B．the regional economy has ranked first in the world's high-growth areas
C．India plays a very important role in driving the regional economy
D．all the countries have a growth rate of over five percent