The following incomplete (columns have missing amounts) pension spreadsheet is for Old Tucson Corporation (OTC).

					Plan				Prior Service				Net				Pension								Net Pension
($ in millions) Debit (Credit)	PBO				Assets				Cost				(Gain)Loss				Expense				Cash				(Liability)/Asset
Beginning balance		(500	)											58
Service cost																		62
Interest cost
Expected return on assets																		(23	)
Gain/loss on assets														(2	)
Amortization of:
Prior service cost										(6	)
Net gain/loss
Loss on PBO		(25	)											25
Contributions to fund																						(56	)
Retiree benefits paid		43				(43	)
Ending balance		(574	)			288				54				78												(286	)

What was the prior service cost at the beginning of the year?

Group of answer choices

$54 millions.

$48 millions.

$60 millions.

$56 millions.