Before the Big Bang, there was no matter in the universe. It was a dense, hot, soupy mixture. Scientists call this stuff quark-gluon plasma, or quark soup in layman’s terms. , this plasma cooled and gave rise to the first atoms, mostly helium and hydrogen.
, the first stars and galaxies formed.
, scientists still do not have conclusive evidence of how the first stars and galaxies in the universe came into being.

returning points to main account

explanation:

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

the answer is a.

enlisted