Yes you can buy antibiotic over the counter at any pharmacy/drug store
Back them cows and pigs were their food and they raised them for food along with farm crops. now we can just stop at any fast food place or restaurant and get processed/GMO food. some farmers still raise livestock/ domesticated animals but most people don't care to raise them anymore.
You need answers you dimwit bozo
when working out you want to make sure you can meet the task at hand. go little by little until you are able to meet your goal. so to start i would rule out D.
When working with food, personal items such as cell phone should be kept away from where food is stored and prepared.