Ron 大神语法笔记上的一道题

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[size=12.000000pt]                                                                                                                                                                                                Ron 大神语法笔记上的一道题
Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heat from the Earth's interior and producing energy on a commercial scale, enough for efficient generation of electricity and heating factories and home.




[size=12.000000pt]A. and[size=12.000000pt] [size=12.000000pt]producing energy on a commercial scale, enough for efficient generation of [size=12.000000pt]electricity [size=12.000000pt]and [size=12.000000pt]heating
[size=12.000000pt] B. and[size=12.000000pt] [size=12.000000pt]producing enough energy on a commercial scale for electricity to be [size=12.000000pt]generated efficiently [size=12.000000pt]and [size=12.000000pt]to heat
[size=12.000000pt]C. for energy production on a commercial scale, enough for generating electricity [size=12.000000pt]efficiently [size=12.000000pt]and [size=12.000000pt]to heat
[size=12.000000pt]D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating[size=12.000000pt] E. to produce [size=12.000000pt]enough [size=12.000000pt]energy on a commercial scale for [size=12.000000pt]efficient [size=12.000000pt]generation of [size=12.000000pt]electricity [size=12.000000pt]and [size=12.000000pt]heat
答案是D，想请问一下各位大神，红字部分是形容词短语作状语吗，还是从句的省略呀？求解答么么么～～～