Conditional statement is a statement with a hypotesis and a conclusion:
If , then
or mathematically
.
Converse statement of is statement
.
If you negate (that means stick a "not" in front of) both the hypothesis and conclusion, you get the inverse: .
Finally, if you negate everything and flip p and q (taking the inverse of the converse) then you get the contrapositive: .
Then,
Answer: the correct choice is D (the inverse of the original conditional statement).