Read the excerpt from act 1, scene 3, of The Tragedy of Macbeth.Banquo. . . . But ’tis strange:And oftentimes, to win us to our harm,The instruments of darkness tell us truths,Win us with honest trifles, to betray’sIn deepest consequence.

In “to betray’s,” the apostrophe marks an omitted letter in “betray us.” Banquo warns that evil forces may use small truths to win people over and then betray them in matters with serious consequences. The correct choice is “betray us.”

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