(1) Subject to this Act, a bereaved partner shall be entitled to a pension -

(a) where the contribution conditions set out in section 125(1) are satisfied on either the insurance record of the bereaved partner or that of his or her deceased partner,

(b) where the deceased partner was entitled to a State pension (contributory) which included an increase in respect of the bereaved partner by virtue of section 112(1) in respect of a period ending on the deceased partner's death, or

(c) where the deceased partner would have been entitled to a State pension (contributory) at an increased weekly rate by virtue of section 112(1), in the deceased partner's own right, in respect of a period ending on his or her death, but for the receipt by the bereaved partner of a State pension (non-contributory), a blind pension or a carer's allowance.