Hey,
cyarelson, thanks for posting!
I believe you are talking about this question?
So, the sentence given translates to:
If K is NOT picked, then T must be, or
~K --> T
The contrapositive of that statement is:
~T --> K
Which is what the correct answer is! The incorrect answer puts *T* as the trigger. But while the sentence gave us T first, the IF trigger was connected to the idea of "no K" ("if K isn't").
Does that help clear it up?