Final answer:
Morgan merged Edison Electric with General Electric to streamline the company, which later became a leader in many technology fields. The major advantage of Westinghouse's 'alternating current' was the ability to deliver power over much greater distances than Edison's 'direct current'.
Step-by-step explanation:
The correct answer to the question regarding the changes made by Morgan to Edison Electric is that he merged Edison Electric with General Electric. J. P. Morgan used his financial influence to guide the mergers of Edison's enterprises, culminating in the creation of the Edison General Electric Company which would later merge with the Thomson-Houston Electric Company to create General Electric (GE) in 1892.
Furthermore, the major advantage of Westinghouse's 'alternating current' or AC power, as developed by George Westinghouse, was that it allowed machines to be farther from the power source. AC power delivers electricity over greater distances, as opposed to Edison's 'direct current' or DC power, which could only extend two miles from the power source. This was essential for the expansion of electric power to a national scale.