Solution
We need to identify which product categories had the value of products returned (as a percentage of sales) increase for three consecutive months.
The concept here is to track each category's return percentage month by month and look for patterns where the percentage consistently rises over three consecutive months. An increase means the current month's return percentage is higher than the previous month's return percentage.
For Apparel, we see increases from January to February to March (13% → 16% → 20%), which gives us three consecutive months of increase.
For Footwear, we see increases from October to November to December (8% → 9% → 10%).
For Electronics, we don't see any sequence of three consecutive increases either.
The key insight is that we're looking for a pattern where each month's return percentage is strictly greater than the previous month's percentage for three consecutive months.
Therefore, only the Apparel and Footwear category had the value of products returned (as a percentage of sales) increase for three consecutive months.
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