The second statement is the of the first.
a. inverseb. contrapositivec. contradictiond. converse

  b. contrapositive

in the statement that was searched, the responder claims this given is as similar as what is being asked. the second statement is contrapositive which is both converse and inverse.
  the statements possibly are:
“if two lines are not parallel, then a pair of corresponding angles are not congruent. 
if a pair of corresponding angles are congruent, then two lines are parallel.”
hence notice that the second sentence is  inversed in position and at the same time converse. this position stance for contrapositive. it uses the negating claims of both the conditions and alters their state.