What is the rationale behind the principle that a witness does not have to sign or witness the testator sign a holographic will?

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A)With regard to a holographic will,a will that the testator writes or signs in his or
her own handwriting,usually,states do not require witnesses because when the entire will is in handwriting,there is less chance of fraud or forgery.
B)With regard to a holographic will,a will that the testator writes or signs in his or her own handwriting,usually,states do not require witnesses because when the entire will is in handwriting,there is less chance of fraud or forgery.
C)With regard to a holographic will,a will that the testator writes or signs in his or her own handwriting,usually,states do not require witnesses because when the entire will is in handwriting,there is less chance of fraud or forgery.
D)With regard to a holographic will,a will that the testator writes or signs in his or her own handwriting,usually,states do not require witnesses because when the entire will is in handwriting,there is less chance of fraud or forgery.
E)With regard to a holographic will,a will that the testator writes or signs in his or her own handwriting,usually,states do not require witnesses because when the entire will is in handwriting,there is less chance of fraud or forgery.

What Is the Rationale Behind the Principle That a Witness