I think it’s a and I am so sorry if I’m wrong
The rock did not become an igneous rock because igneous rock can not be formed from sedimentary rock. A metamorphic rock can be formed from a sedimentary or igneous rock but an igneous rock can not be formed from a sedimentary or metamorphic rock. Igneous rocks are formed by the cooling and hardening of molten magma only.<span />
When a parent cell makes several nuclei and divides to make several daughter cells, it is called Mitosis.