Poets address the first stage of loss, the lament, in elegies by expressing grief and heartbreak over a person who has died. The correct option is B
A lament is a passionate expression of sorrow, it means to mourn someone. So that, option B is the answer that is most related to the meaning of lament.
An elegy is a sad poem that is often written in an attempt to praise and express sorrow for someone who has passed away.