Final answer:
Macbeth's reaction to Duncan's plans for his son, Malcolm, is shown in lines A of the passage.
Step-by-step explanation:
In Macbeth by William Shakespeare, Macbeth's reaction to Duncan's plans for his son, Malcolm, is shown in the lines:
A. Which do but what they should by doing everything
Safe toward your love and honor.
These lines indicate that Macbeth agrees with Duncan's plans for Malcolm and acknowledges the importance of loyalty and honor.
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