Question

which other celestial body is roughly the same size as eris?
triton
pluto
neptune
dysnomia

Explanation:

Eris is a dwarf planet in the outer solar system. Among the options, Pluto (also a dwarf planet) has a diameter roughly similar to Eris—both are around 2,300 km. Triton is a moon of Neptune (~2,700 km, slightly larger), Neptune is a gas giant (much larger), and Dysnomia is Eris's small moon (much smaller).

Answer:

Pluto