Arrange the following parts of a sentence to make a meaningful sentence.

P: around the town
Q: when I was young,
R: delivering food to customers
S: shopkeepers would cycle

Part Q introduces the sentence by establishing the timeframe. Part S fits nowhere better than right after Q. Part P follows by explaining where shopkeepers would cycle, elaborating that they would cycle 'around the town'. Part R concludes the sentence by explaining why shopkeepers used to cycle, stating that they did so to deliver food to customers. The final sentence would be:

When I was young, shopkeepers would cycle around the town delivering food to customers.

The correct answer is QSPR.