Which source would best support an argumentative essay on the importance of protective gear for those playing sports?

a an editorial on the need for a community sports complex
b an interview with a professional golfer
c a case study of sports-related injuries
d a medical journal on the causes of tennis elbow

the answer is C.  

i could be wrong, but hopefully im not.

C a case study of sports-related injuries  This is the correct answer.

An argumentative essay needs a written and formal support: a case study has these characteristics. This sort of text describes and analyses problems. The problem is related to sports injuries , so a solutions can be given in that text. A solution to this problem may be wearing protective gear. This solution will be supported by certain arguments where the focus will be set on the importance of the protective gear.

These options are not right:

A an editorial on the need for a community sports complex ( This text is on a sports complex not on  injuries people in sports may get).

B an interview with a professional golfer ( This support is oral not written. Besides, the topic of the interview may not be related to injuries).

D a medical journal on the causes of tennis elbow ( This is a formal and written support  but the topic is on the causes of injuries just tennis players have. Besises,  it is about causes but not on solutions.)

it should be repealed cuase its not fair