Scientists at the Los Alamos National Laboratory have

Question

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 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 efficiently and to heat
C. for energy production on a commercial scale, enough for generating electricity efficiently and to heat
D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating
E. to produce enough energy on a commercial scale for efficient generation of electricity and heat

Please explain your answer and what's the idiom or construction tested here?

Thanks

abhijit_sen · Answer

A. and producing energy on a commercial scale, enough for efficient generation of electricity and heating
If we have "and" then we should expect here "produced" and not "producing", because of parallelism with "succeeded".

B. and producing enough energy on a commercial scale for electricity to be generated efficiently and to heat
If we have "and" then we should expect here "produced" and not "producing", because of parallelism with "succeeded".

C. for energy production on a commercial scale, enough for generating electricity efficiently and to heat
"for generating..." not parallel with "to heat...".

D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating
Seems OK.

E. to produce enough energy on a commercial scale for efficient generation of electricity and heat
"for efficient generation..." not parallel with "heat...".

IMO D.

tarek99 · Answer

OA is D. Great job and thanks for your explanation!

spriya · Answer

Kindly let me know if the idiom rule applies to highlighted part

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 homes.

I feel the parallelism should occur in this part of setence also..There (C) does not hold good.Pls explain the answer

x2suresh · Answer

You mean D...

following idiom can found in A and B .. but they are not logically good.
Succes in X and Y ..(
succeeded ... in mining...(X) AND Producing ..(Y)...
---> this means succeeded for fist time in X and succeeded for fist time in Y( Producing energy on commercial scale..this is wrong.. "producing energy commercial scale.. may already succeded by other methods too...)

succeded for first time in mining heat... to produce energy on comerical scale( this is what they succeeded first time)

hanumayamma · Answer

Somhow I didn't checked the idiom - 
Answer E

Sentence has parallel issue – Scientists at … have succeeded … and producing … 
Eliminate A, B and C

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 efficiently and to heat  
C. for energy production on a commercial scale, enough for generating electricity efficiently and to heat  
D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating  
E. to produce enough energy on a commercial scale for efficient generation of electricity and heat

Scientists at the Los Alamos National Laboratory have

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