4. Beta Contractors, Inc., which follows US GAAP, has contracted to build a stadium for the Far-away City. The contract price is $100 million and costs are estimated at $60 million. Costs are not assured, however, because there is a material risk, which Beta Contractors has assumed, that ground water problems might slow construction and increase costs by as much as $40 million. In 2020, the first year of the agreement, Beta Contractors, Inc. billed $30 million, received a $20 million payment, and incurred $15 million in costs. For 2020 Beta Contractors, Inc. should recognise revenue from the Far-away City in the amount of: A. $0. B. $20 million. C. $25 million. D. $30 million.