If your knees hurt after a one-week walking regimen, which one of the following workout changes would be most appropriate? a. take a week's rest from exercise. b. wear different shoes. c. jog in a swimming pool. d. switch to anaerobic exercise. c?

I would suggest C. jog in a swimming pool.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.