Step 1: Separate the two sides of paging.
Paging always has two matching halves, the logical side that belongs to the process, and the physical side that belongs to actual RAM. It helps to keep these two vocabularies separate in your mind.
Step 2: Assign the correct term to each side.
The process's logical address space is chopped into fixed size blocks called pages. The physical RAM is chopped into fixed size blocks of the identical size, and these physical blocks are called frames. A page table simply maps each page to whichever frame currently holds it.
Step 3: Apply this to the question.
The question specifically asks about physical memory being divided, so we must use the physical side term, not the logical side term. Segments belong to a different memory management scheme called segmentation, and Blocks is too generic a word here.
Step 4: Conclude.
Physical memory divided into fixed size units is called
\[ \boxed{\text{Frames}} \]