In our Universe, we can consider four different regimes of space in which distances between objects might be changing as a result of the general expansion. These are (1) distances between different parts of the Earth, (2) distance between planets in our solar system, (3) distances between stars in our Galaxy, and (4) distances between clusters of galaxies.
In which of these regimes are the distances changing because of the universal expansion? 

A) 4 only. 
B) 4 and 3. 
C) 4, 3, and 2. 
D) 4, 3, 2, and 1.