Alka-Seltzer Was Originally Made as a Hangover Remedy That Cured

Alka-Seltzer was originally made as a hangover remedy that cured a headache and settled the stomach.Today,you can purchase Original Alka-Seltzer,Extra Strength Alka-Seltzer,Alka-Seltzer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.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