Step 1: Find the sentence that opens the topic.
R reads: "Learning is important for both people and organizations however." This works well as an opening statement, introducing the general topic of learning, with "however" signaling that a contrasting idea is about to follow.
Step 2: Find what the "however" leads into.
P reads: "The real challenge today is unlearning, which is much harder." This is the contrasting idea promised by "however" in R: learning matters, but the harder task is actually unlearning old habits or ideas.
Step 3: Find the sentence that explains why unlearning is difficult.
S reads: "Each of us has a mental model that we've used over the years to make sense, but." This begins to explain the reason unlearning is hard: we all carry old mental models, and the word "but" at the end promises another contrast.
Step 4: Find what completes that explanation.
Q reads: "The new world of business behaves differently from the world in which we grew up." This completes the contrast begun in S, explaining that our old mental models no longer match how business actually works today.
Step 5: Assemble and match.
The order R-P-S-Q forms two connected sentences: "Learning is important for both people and organizations, however, the real challenge today is unlearning, which is much harder. Each of us has a mental model that we've used over the years to make sense, but the new world of business behaves differently from the world in which we grew up." This matches option (d), RPSQ.