prep语法求解！

cinderellahjy

Q37. p1-sc 44. (26787-!-item-!-188;#058&002971)
Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heatfrom the Earth's interior and producing energy on a commercial scale, enough for efficientgeneration of electricity and heating factories and homes.
(A) and producing energy on a commercial scale, enough for efficient generation of electricity and heating
(B) and producing enough energy on a commercial scale for electricity to be generated efficientlyand to heat
(C) for energy production on a commercial scale, enough for generating electricity efficiently andto heat
(D) to produce energy on a commercial scale, enough for generating electricity efficiently and forheating
(E) to produce enough energy on a commercial scale for efficient generation of electricity andheat

为什么B不行？ and后produce用ing 结构与前面in mining平行不行吗？
                        
               

cinderellahjy

求解啊！！