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(A) CPU
(B) CD-ROM
(C) Graphies card
(D) Hard disk
Every option have impact on it. But CPU is the best answer.
It is the cPU then hard drive. Increasing the memory also helps.
CPU would be generally correct, though SSD (HDD) have some impact on speed due to faster access speeds when you have an optimal speed processor.
the cpu which is the processor has the most effect on the performance speed of a pc
As a whole unit (A) CPU is the right answer.