NEW YORK -- The price of oil is falling after Saudi Arabia promised to keep markets well-stocked with petroleum.The world's biggest oil producer made the announcement Tuesday in reaction to fears that a standoff over Iran's nuclear program could hurt oil supplies from the Middle East. The Saudis say they're ready to meet any shortfalls -- perceived or real -- in global oil supplies. Oil has jumped by 9.3% since January. Concern about a slowdown in China's economy may also be pressuring oil prices Tuesday. Benchmark U.S. crude gave up $2.13 to $105.96 per barrel in New York while Brent crude lost $2.16 to $123.55 in London. Meanwhile, retail gasoline prices are now averaging $3.846 per gallon.