A dramatic monologue is a poem in which a single speaker speaks throughout the poem.
The speaker usually reveals his or her character, psychology, situation, and attitude through the speech.
So Assertion (A) is correct.
A dramatic monologue may have a silent listener, but the main focus is on the single speaker's speech.
The author's presence is not directly known in the poem.
The reader usually infers the speaker's personality and situation from the speaker's own words.
The given Reason (R) is not accurately framed because it wrongly emphasizes the author's presence.
Therefore:
\[
\text{Assertion (A) is correct, but Reason (R) is not correct.}
\]