In the given figure, ΔABC and ΔOBC are both isosceles with base BC
It can be concluded that:
ΔAOB≅ΔAOC
SSS rule is applied
In ΔAOB and ΔAOC,AB=AC(Sides of isosceles ΔABC).OB=OC(Sides of isosceles ΔOBC).AO is common∴ΔAOB≅ΔAOC(by SSS congruence)
Hence, options A and C are correct.