Answer: B - The species would decrease in number and eventually die off.
Explanation: If species no longer reproduced, new species wouldn't be created, therefor if all the species that can't reproduce died off, they would go extinct since they can no longer reproduce.
Magma is basically molten rock but INSIDE the earth, Lava is Molten rock that is no longer under the crust, and is on the surface (like lava from a volcano