FOR THE ONES ON THE ZOOM MEETING THAT JUST ENDED< ITS BACK UP

What's the waste product of electrons and pyruvate combining in fermentation?  

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Which is the most likely reason the writer of the play pygmalion chose to change the character of galatea from a statue to working-class woman?