Maximum running process does depend on CPU core .
If cpu is C core then there can be C running process out of N , therefore N-C prempted.
option a ) false
dosent justify if we are running 3 process concurrently so atmax 2 could be prempted then only statment could be justified.
option b) false
option c ) false
To be in ready state there is no such relation to cores of Cpu , there can be any no of processes in ready state os will pick process acc to the cores in Cpu available from there.
option d ) true