Explanation
A. The claim cannot be justifiably rejected based on the passage provided, as the character is able to read and express his thoughts on the writing, which implies literacy.
B. The passage does not provide information about whether the character of Demosthenes is based on a historical figure or not. Even if he were based on a historical figure, it would not be relevant to the act of reading from the tablet.
C. The passage actually supports the claim that reading aloud from written texts was part of on-stage action in ancient Greek plays, as evidenced by Demosthenes' actions.
D. (Correct Response) Since Demosthenes reads the tablet and expresses amazement at its contents before explaining it to his companion, this suggests that he was reading silently to himself first. This claim can be rejected based on the passage.
E. The passage does not provide information on the frequency of prophecies being written down on writing tablets in ancient Greece.