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could anyone tell me what's wrong with C

i have a question about why we can not use "what it" here

A survey of 765 working women over eighteen years of age found that 60 percent of them worked 40 or more hours a week and for married women with children under eighteen it was more likely that they would work different shifts from their husbands (A) for married women with children under eighteen it ...

The majority of scientists believe that to reduce and stabilize atmospheric concentrations of carbon dioxide, emissions must be cut at the source by fossil fuels that are burned more efficiently and, in some cases, by alternatives such as hydrogen fuel cells that can replace fossil fuels altogether....

hi
i have a question about (c)
why to suggest can not use here?

hi Ron
can you explain what is wrong with (E)

HI
Can i say that (c)and (d) are wrong because "as" must add clause?

i got it!!
thanks for explain

Are (A) (B) (D) (E) wrong because emission can not be cut by fossil fuels or alternatives ?