Why people think Shakespeare may have not written Macbeth?

The history of mankind is a history of repeated injuries and usurpations on the part of man toward woman, having in direct object the establishment of an absolute tyranny over her." in this sentence, the term "usurpations" carries the connotation a) indicative of intense debate. b) suggestive of violent injustice. c) suggestive of articulate slander. d) indicative of controlling retribution.