What's the difference between magma and lava

A) there isn’t a difference, they are just two names for liquid rock- Lava is liquid rock above the surface of the Earth, and magma is liquid rock below the surface of the earth .

B) Magma and lava are two different matter. Lava is hot, liquid rock; magma is hot, soft, solid rock

C) Magma and Lava are different temperatures- magma is hot, and lava is cold