The Attestation in the Will of a Omitted to State

The attestation in the will of A omitted to state that the testator signed the pages of the will in the presence of the instrumental witnesses. Can evidence aliunde be admitted to prove such fact in the probate proceeding?

A) Yes, to give due course to the petition for probate.
B) No, because such fact cannot be determined from an examination of the will itself.
C) Yes, because the will of a person is his voice even after his death. (Reyes v. CA)
D) Yes, because the court should give tender care to the will.