【单选题】In the fourth paragraph, why do many companies prefer to diversify rather than stay in a concentrated market
A．To reduce the risk
B．To spread the risk
C．To earn a high rate of return
D．To strengthen the market position
【单选题】In the fourth paragraph, why do many companies prefer to diversify rather than stay in a concentrated market
A．To reduce the risk
B．To spread the risk
C．To earn a high rate of return
D．To strengthen the market position
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