Final answer:
In act 3, scene 5 of 'Romeo and Juliet', when Juliet says she sees Romeo as one dead in the bottom of a tomb, the literary device used is foreshadowing.
Step-by-step explanation:
In Romeo and Juliet act 3, scene 5, the literary device used when Juliet says, "Methinks I see thee, now thou art below, As one dead in the bottom of a tomb," is foreshadowing. This device is employed by Shakespeare to hint at the future tragic events of the play, particularly the death of the characters in a tomb, which aligns with the play's ultimate conclusion. Although there are elements of figurative language in the description, the primary purpose of these lines is to foreshadow the fate of the characters, making the answer B. Foreshadowing.