GMAT Test Prep: SC-18588642 GMAT Sentence Correction | TOEFL IELTS GMAT GRE SAT ACT PTE ESL

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