The world "yields" (line 13) means ______.

A．Because the cotton was genetically modified.
B．Because the cotton was found to damage the environment.
C．Because the cotton harms the bollworm.
D．Because Monsanto dismissed the research.

A．The US's Monsanto agreed with the results of Chinese scientists study
B．GM cotton is an ideal crop
C．The US's Monsanto dismissed the research for its own profit
D．Cotton bollworm has no resistance to Bt cotton over time