If Lehmann boundary and Moho boundary are treated as same what is the error?

Correct answer: Moho is crust mantle boundary and Lehmann is boundary within core

Moho and Lehmann are names for different seismic boundaries, so treating them as identical mixes up separate parts of Earth’s structure. The Moho is the discontinuity between the crust and the mantle. It is relatively shallow compared with boundaries inside the core. The Lehmann discontinuity is generally used for the boundary between the liquid outer core and the solid inner core, within the core itself.

Seismic waves reveal these boundaries because their speed, direction, or ability to pass through a material changes at each discontinuity. Thus, the two names must be linked with their correct locations and layers. They are not rainfall, river, or population boundaries. Option A is correct because it preserves the distinction between the crust–mantle boundary and a boundary within the core.