A Primary Reason for Why Mergers and Acquisitions Sometimes Fail

A primary reason for why mergers and acquisitions sometimes fail is due to the:

A) misinterpretation of the cultural differences,like employee disenchantment and low morale,differences in management styles and operating procedures,and operations integration decision mistakes.
B) execution of functional and integration activity,while sustaining and capitalizing on the combined sources of revenue.
C) development of effective integration plans conducive to employee satisfaction.
D) advertising message detailing the merger announcement.
E) All of these.