There is a theory that gravity could have called could pull back galaxies back together causing a reverse big bang which observation makes a theory less likely than the idea that the universe make you continue to expand

I believe the answer is C.

Universe is expanding at an accelerating disk.

Explanation:

As the universe will continue to expand the galaxies are getting far away from each other and all this has started about 5 billion years ago. Thus the universe will accelerate and expand at a much faster rate and this will grow outwards an give the universe a linger life cycle.

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.