AmazonCom Pursued a Combination of Actions Such as Making Service

Amazon.com pursued a combination of actions such as making service improvements,cutting costs as well as forming alliances with web portals to expand its share of online shoppers,even though the expense of such activities postponed the firm's ability to become profitable.This is an example of expansion by:

A) diversifying
B) selling existing products to new segments
C) developing new products for current customers
D) increasing market penetration of current product