The marketers at Nivea included a trial size of their new lotion in the September issue of Cosmopolitan Magazine. National sales increased dramatically within a few weeks, an example of

The marketers at Nivea included a trial size of their new lotion in the September issue of Cosmopolitan Magazine. National sales increased dramatically within a few weeks, an example of this product’s
A)compatibility.
B)complexity.
C)observability.
D)competitive advantage.
E)trialability.