the answer is definitely not c., and from briefly looking at Sparknotes, I would say the answer is a.
HE MUST CLEARLY EXPRESS HIS IDEAS IN HIS WORKS.
James Joyce's conception of the artist emphasizes that the artist should be invisible in their work to allow the art to speak for itself. He articulated this through the character of Stephen Dedalus, who argued that an artist, like God, should remain behind their creations. Therefore, the correct answer to the question is B. He must be invisible in his works.
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