Final answer:
The poet's diction contributes to an exaggerated tone of dread or horror, effectively characterizing the wedding-guest's reaction.
Step-by-step explanation:
The most accurate evaluation of how the poet's diction contributes to tone in lines 79–82 is option 3:
diction: archaic language (look'st thou so) with word choices suggesting torment or the supernatural (fiends / plague) evaluation: creates an exaggerated tone of dread or horror, effectively characterizing the wedding-guest's reaction.
The use of archaic language and word choices that suggest torment or the supernatural adds intensity and an element of fear to the tone. This choice effectively portrays the wedding-guest's strong reaction to the situation.