Definition: This is the expense for a good or product that changes in proportion to the activity of the company
Example: A wholesale club may purchase toilet paper in larger quantities to reduce the final price.
Term: Type term here
EO

dude you should crop your image so only the question shows. but   can you explain it better

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.  

the correct answer is c.