World records after 1990's have shown a sharp decline. The reason could be:
A. Drug dependence had weakened the athletes.
B. Athletes became aware of the side effects of such drugs.
C. New and sophisticated anti-doping tests dissuade such athletes from such drug abuse.
D. The athletes were worried about life ban if they were found cheating.
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Explanation:
C. New and sophisticated anti-doping tests dissuade such athletes from such drug abuse.
Answer:
Your answer is:
C. C. New and sophisticated anti-doping tests dissuade such athletes from such drug abuse.