One of the advantages of e-commerce is that it: a. is highly accessible throughout the world.
b. guarantees privacy and security of buyers.
c. is a universally accepted system.
d. improves customer service.

d. improves customer service.

Explanation:

E-commerce means electronic commerce i.e. buying and selling the products and services online. It could be either business to business, business to consumer, consumer to consumer etc

The advantage of the e-commerce is that it improve the service that provide to the customer as if the customer service is good so the customer would purchased more and more due to which the company is able to reach its goals. Like home delivery of products

Therefore the option d is correct

i know right it’s not fair some people are just so rude unlike you your actually trying to get to know people and i think that is very kind