Asoccer player who is recovering from a knee injury and is not allowed to change directions can maintain her cardio fitness level by attending a kickboxing class lifting weights swimming laps taking an aerobics class

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The correct answer is C. Swimming laps. 
This is because it is easy on the joints.

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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.