Which of the following paraphrases hubble law?
select one:

a. the greater the distance to a galaxy, the greater its redshift.
b. the more distant a galaxy is, the younger it appears.
c. the older the galaxy appears to us, the more luminous it is.
d. the faster the galaxy spins, the more massive and luminous it is.
e. the greater the distance to a galaxy, the fainter it is.

When we talk about the visible electromagnetic spectrum, we know it starts in violet-blue and ends in red.  

Now, in this context the astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed the spectral lines were displaced towards the red (red shift), whereas the nearby stars showed a spectrum displaced to the blue.  

From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum, and noted that all galaxies are "moving away from each other with a speed that increases with distance", and enunciated the now called Hubble–Lemaître Law.

This means in the past the distance between two galaxies was smaller than at present, being this the proof that the universe is expanding (like a balloon expands when it is filled with air or another gas).  

At this poitn it is important to stay clear that the redshift is not produced by the relative movement of the galaxies with each other.  This effect is in fact, due to the own expansion of the space among the galaxies.  

a maximum–minimum thermometer. the scales are fahrenheit on the inside of the u and celsius on the outside. the current temperature is 23 degrees celsius, the maximum recorded is 25, and the minimum is 15, both read from the base of the small markers in each arm of the u tube. the bulbs are hidden by a plastic housing.

six's thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. it is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. it was invented by a british scientist james six, born in canterbury, in 1780; [1] the same basic design remains in use.

it is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design.

the thermometer indicates the current temperature, and the highest and lowest temperatures since last reset.