The last step is D, because after you find it and look into it you need to do it so that you know it is right.
It is the third answer choice. the other answers are not covered or talked about in the passage. the passage mainly talks about how their relationship is not going to work out well at all. Hope this helps
Predict-
say or estimate that (a specified thing) will happen in the future or will be a consequence of something.
ponder-think about (something) carefully, especially before making a decision or reaching a conclusion
clarify-the quality of being clear, in particular.
infer-deduce or conclude (information) from evidence and reasoning rather than from explicit statements
<span>limited roles available to women in the 1950s.</span>