Technically A. As the universe expands outwards, every simgle atom gets further away from every single other atom. Every galaxy is moving away from every other galaxy. No galaxies are moving towards another galaxy.
An observation of the red shift of galaxies suggests that the universe is expanding. The correct option among all the options that are given in the question is the first option or option "a". I hope that this is the answer that you were looking for and it has actually come to your help.
