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

Alka-Seltzer was made originally as a hangover remedy that cured the headache and settled the stomach.Today,you can buy Original Alka-Seltzer,Extra Strength Alka-Seltzer,Alka-Seltzer Morning Relief (for morning headaches and fatigue) ,and Alka-Seltzer Heartburn Relief.Each Alka-Seltzer product has a unique formulation to relieve a specific malady that makes them more specialized than competing products.The maker of Alka-Seltzer is using

A) product variation.
B) product differentiation.
C) market sectioning.
D) product segmentation.
E) product base development.