Hi there, thanks for your post. This is a Parallel Reasoning post.
Let's first examine the reasoning in the stimulus.
You are told that one event (the adoption of the free trade policy) happened before another (economic conditions improved). From this fact, a conclusion is drawn (the rise in the prosperity of England subsequent to 1840 can be attributed to the adoption of the free trade policy).
Answer choice (D) proceeds in parallel fashion: You are told that one event (the vice president's new morale-building program) happened before another (the improvement in the company's profitability). From this fact, a conclusion is drawn (the vice president's program can be credited with the improved result).
Hope this helps! Please let us know if you have any additional questions.