The discovery that most galaxies have red shifts implies that

implies that the universe is expanding.

By the doppler shift, you can have two shifts, the red implies that something is going further away from you, and a blue shift means that something is coming towards you. So the fact that most galaxies are getting further away, implies that there is a expansion occurring.

step-by-step explanation:

we are given

we have to simplify it

firstly, we will factor it

now, we can cancel like terms

now, we can combine it

so, we get

the answer would be a