regarding paging

Hello,
I have a problem that I can’t solve. Can you kindly solve it for me? The problem is like that:-

Consider a machine with 64 MB physical memory and a 32 bit virtual address space.If the page size is 4 KB, what is the approximate size of the page table?

a> 16 MB b> 8 MB c> 2 MB d> 24 MB

Please tell me what will be the answer given above with explation i.e, the detail process to solve this type of problem.

Thank You.