Solution 3 Your SWOT analysis should have indicated that Black’s lower side moyo was not only the largest structure on the board but also the one nearest completion. So your inescapable conclusion should have been that White’s immediate action to reduce it was essential!
If that was your conclusion, consider your answer correct even if you didn’t find the specific starting point or sequence shown, which is more or less “standard” in similar (and not infrequently occurring) positions.