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Ans . C

AC - stands for accumulator, it is a register provided in microprocessor/micro controller to store temporary result after ALU performs operation on input Data.

SP --Stack pointer is used to store data on top of Stack(a set of memory location).it is utilized during execution of Jump instructions to store address of next instruction to be executed. it can also be used to store data by using instructions PUSH(to store the data) and POP (to retrieve the data).

HL--it is 16 bit temporary register inbuilt in microprocessor.They are also called as Memory registers.

PC--Program counter is used to store the address of next instruction to be executed.