Concept:An epic is the literary term for a long narrative poem that recounts the heroic exploits of a legendary hero.
Explanation:The key phrase in the question is "long narrative poem" and "heroic exploits."
Among the options, only the epic matches both features fully.
A panegyric is a short poem or speech composed in praise of an individual.
A lyric is a brief poem that expresses the poet's personal thoughts and feelings.
A ballad is a narrative poem, but it is usually short and composed to be sung.
An epic is unusually long and centres on a hero whose actions shape the fate of a people.
Thus, the term that fits the description is epic.
Answer:D. epic