According to Mr. Gilmore the spread of snakehead is ______.

A．took 10 years to double its real incomes per head
B．has caught up by adopting advanced countries' technology
C．will see a sustained economic growth in the coming years
D．accounts for the bulk of world production

A．the dramatic shift of the world economic balance
B．the impact of the emerging economies of the "third-world"
C．China and India's rapid economic development
D．rich countries' gain and loss in recent world economies