The feet of a poem can easily be compared to

A poetic foot is “a unit of stressed and unstressed syllables in a line of poetry. Poetic feet are based on the number of syllables in each foot. Two of the most common feet in English poetry are the iamb and the trochee. Both are made up of just two syllables.

Explanation:

the primary theme of "elegy written in a country churchyard" is a reflection about the significance of the lives of a group of modest people buried in a rural church cemetery. elegies focus on the death of an individual or group of people, and they generally have a melancholy tone. hope this you all.

i think it could possibly be b