212. Following the destruction of the space shuttle Challenger, investigators concluded that many key people employed by the National Aeronautics and Space Administration and its contractors work an excessive amount of overtime that has the potential of causing errors in judgment.

(A) overtime that has the potential of causing

(B) overtime that has the potential to cause

(C) overtime that potentially can cause

(D) overtime, a practice that has the potential for causing（E）

(E) overtime, a practice that can, potentially, cause

D读起是不怎么样，但是根据tonyaddias的总结 can potentially 这两个词一起出现就是redundency....

confused