Alka-Seltzer Was Originally Made as a Hangover Remedy That Cured

Alka-Seltzer was originally made as a hangover remedy that cured a headache and settled the stomach. Today, you can purchase Original Alka-Seltzer, Extra Strength Alka-Seltzer, Alka-Seltzer Morning Relief (for morning headaches and fatigue) , and Alka-Seltzer Heartburn Relief, each of which has slightly different ingredients to solve the problem identified in its respective brand name. To broaden the product line to increase sales to new target market segments, the makers of Alka-Seltzer used a __________ strategy.

A) product modification
B) market-product grid
C) diversification
D) market modification
E) product class extension