According to the passage,the reason for China to invest overseas in infrastructure and construction is to( )
A.restore the country’s old maritime and overland trade routes
B.lift the value of trade with more than 40 countries to $2.5 trillion within a decade,spending nearly $1tillion of government money
C.form an outlet for the vast overcapacity in industries such as steel and heavy equipment
D.lead to a massive spending binge