Answer:
C. To the two legs of a compass.
Step-by-step explanation:
John Donne's poem "A Valediction: Forbidding Mourning" is a metaphysical poem about the parting of two lovers. This farewell speech of the poet and his wife is a form of forbidding a person to be sad at the parting.
Lines 25 to 28 goes as follows-
If they be two, they are two so
As stiff twin compasses are two;
Thy soul, the fixed foot, makes no show
To move, but doth, if the other do.
It is here that the speaker makes a comparison between him and his lover and the two feet/ legs of a compass. Thus, the correct answer is option C.