Coca-Cola has expanded to Diet Coke, Cherry Coke, and Caffeine-free Coke, to name a few. These are examples of

a. product modifications.

b. line extensions.

c. functional modifications.

d. aesthetic modifications.

e. product lining.

b. line extensions

Explanation:

Line extensions -

It is the method to publicize certain goods or services, under the name of a well established company, is referred to as line extension.

In this case, the people tries to add new and innovative goods and services to their existing product line, in order to increase the profit.

They make changes in the flavours, variety and methods.

Hence, from the given scenario of the question,

As Coca - Cola expanded various new Coke options, showcasing the method of Line extension.