Based on the excerpt, which is the most reasonable plot prediction?
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farquhar will get caught by northern forces.
farquhar will attempt to tamper with the bridge.
farquhar will discover the truth about the soldiers he's speaking with
farquhar will be executed for his crimes against the north.

Farquhar will attempt to tamper with the bridge.

Explanation:

An Occurrence at Owl Creek Bridge

by Ambrose Bierce tells us a story about Peyton Farquhar, planter, devoted to Southern( Confederate) army. In this excerpt we learn about an unknown passenger, who was Northern (Federal) scout disguised in Confederate soldier, passing by Farquhar`s house. They engage in an informal talk in which Farquhar finds out that a bridge not so far away is being repaired along with the railroad by Northern army. The man acknowledges that it is forbidden to be around it or worse trying to sabotage Northern army and that the person who dares to do that will be hung. So knowing Farquhar`s commitment to Southern army and this a little obvious questioning the passenger, we can assume that he has some malicious plans.

glamis thou art, and cawdor; and shalt be what thou art promis'd; yet do i fear thy nature; it is too full o' the milk of human kindness to catch the nearest way: thou wouldst be great; art not without ambition; but without the illness should attend it. what thou wouldst highly, that wouldst thou holily; wouldst not play false, and yet wouldst wrongly win: thou'dst have, great glamis, that which cries, "thus thou must do, if thou have it: and that which rather thou dost fear to do than wishest should be undone." hie thee hither, that i may pour my spirits in thine ear; and chastise with the valor of my tongue all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal.  

he lacks ambition.  

he is hesitant.  

he lacks courage.  

he has moral scruples.

yes, post it and i can try to you out.