Choose the sentence that correctly combines a modal verb with a passive construction and accurately reflects the content of Ocko's talk.

Question

Accepted Answer

Landfill methane could have been captured using vacuum systems and converted into electricity far earlier than it was.

Answer

Landfill methane could captured using vacuum systems and converted into electricity far earlier.

Answer

Landfill methane must be captured using vacuum systems and converting into electricity far earlier.

Answer

Landfill methane should captured and have been converted into electricity far earlier than it was.

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