Option 1 -> Echo means to repeat or reflect sound; involves repetition rather than imitation with intent to match.
Option 2 -> Reiterate means to say or do something again; focuses on repetition, not imitative behavior.
Option 3 -> Envy means to desire what another has; relates to feeling jealous, not copying or imitating.
Option 4 -> Mimic means to imitate or copy someone's actions or behavior; directly aligns with emulating.
Hence, Option 4: Mimic -> EMULATE means to imitate or copy someone with the aim of matching or excelling their achievement, making "mimic" the closest synonym as both involve replicating behavior or actions -> correct