我国有权制定行政法规的主体，限于()。

A．国务院

B．国务院和省级人民政府

C．国务院及国务院各部、各委员会

D．国务院和省级人民政府及较大市的人民政府

John Klement is a soybean farmer who harvests 125000 bushels of soybeans annually. Klement’s fixed costs are $ 200000 and his variable costs are $ 5 per bushel. Soybeans are currently priced at $ 5.35 per bushel. Based on his estimates, Klement sees soybean prices being relatively stable for the next two years, then increasing to $7.00 per bushel due to increased demand from Japan. What action should Klement take Klement should:（）

A. shut down for two years and then restart his business. 

B. cut his production by 50% for the next two years and then resume full production. 

C. continue operating his business as usual.