Why don't some people think shakespeare wrote his plays? select all that apply.

a. the quality of his work improved after christopher marlowe's "death."
b. he was probably not in london when most of the plays were written.
c. he lacked a college education.
d. shakespeare of stratford could not have known the customs and manner of the upper class.
e. there is no record of someone named "william shakespeare" working in the theater.
f. there was no name written on any of the manuscripts.