In the past, infants who were not breast-fed were fed cow's milk. Then doctors began advising that cow's milk fed to ...

I thought the answer would be E because I used the line "Once this advice was widely implemented, that was an alarming increase in the incidence of scurvy in infants." to infer that since there were more infants with scurvy, more mothers fed their children boiled cow milk. Is this wrong because of a numbers vs proportion mistake I made? Or, is there another reason? I narrowed it down between A and E and I couldn't explain E away/figure out why it was wrong. Thanks!