📊 GMAT Exam Prep

A local coffee shop increased its average customer spending by 15% after introducing a loyalty program offering a free pastry for every ten coffee purchases. This suggests loyalty programs are highly effective in boosting sales for small businesses.

A The coffee shop also offered new, higher-priced menu items during the same period.
B Customers were unaware of the loyalty program's existence until after its implementation.
C Other local coffee shops that implemented similar loyalty programs also reported significant increases in customer spending.
D The loyalty program only appealed to customers who already purchased coffee frequently.

✓ Correct Answer: Option C

This option strengthens the conclusion by showing that the observed effect (increased spending) is not unique to this single coffee shop, but is repeatable across similar businesses implementing similar programs, thus increasing generalizability.

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