Question

role in the play. which option would be the most effective?
using a rhetorical question to ask what committing murder has cost macbeth
using zeugma to connect duncans crown with the crown that macbeth later wears as king
using metonymy to connect banquos sword to the murder of the sleeping duncan
using synecdoche to contrast lady macbeths desire for power with macbeths capacity for

Explanation:

A rhetorical question about the cost of Macbeth's murder directly highlights the core tragic consequence of his actions—his lost sanity, relationships, and peace—making it the most effective at emphasizing his tragic role. Zeugma here would be a weak, forced link between crowns; metonymy of Banquo's sword is irrelevant to Duncan's murder (Banquo did not kill Duncan); synecdoche for the Macbeths' power dynamic does not center Macbeth's own tragic downfall as clearly.

Answer:

using a rhetorical question to ask what committing murder has cost Macbeth