Overtraining Syndrome (Or Unexplained Underperformance Syndrome) Has Been Defined as a Persistent

Overtraining syndrome (or unexplained underperformance syndrome) has been defined as a persistent decrement in athletic performance capacity despite how many weeks of relative rest?

A) 1 week
B) 2 weeks
C) 4 weeks
D) 52 weeks
E) None of the above