What latitudes are most likely to see glaciers?

90 degrees is the maximum latitude - (90 degrees N - this is at the North Pole, and 90 degrees S - for the South Pole).

So, 90 degrees N and 90 degrees S are the latitudes where is most likely to see glaciers.

** Degree - mean " ° ", So, you can write 90 degrees N as 90° N ** 

Dall of the above all of the choices make sense