Reson for Option – A
lets say you have a process with a total memory footprint of (9*1024KB + 100KB) (text, data, stack, heap), And you use 1024KB as page size, there will be 10 page faults on behalf of the process throughout its execution.
Instead of 1024KB you now use page 10240KB (10 times previous size), now throughout the process life time there will be only 1 page fault. Although you save time spent for all those page faults, you are spending more time in swapping this really big page from swap space to main memory, as there will be other processes contending for space on main memory