I’m pretty sure the answer is c.
Since each I guess ‘layer, or cubes will have 12 cubes.
The height is 4
12*4=48
I hope this helps, I’m really sorry if the answer is wrong
Total pages=125
Pages read in 1 day=12
Pages read in 4 days=4×12=48
Left pages to read=125-48=77 pages
There is nothing there to work with