A drop in oil prices helped send the U.S. stock market to its best day since the war in Iran began. The S&P 500 climbed 1% Monday for its biggest gain in five weeks. The Dow Jones Industrial Average added 0.8%, and the Nasdaq composite jumped 1.2%. The price for a barrel of benchmark U.S. crude fell toward $93 after topping $102 in the morning. The fall in oil prices not only helped boost stocks of companies with big fuel bills but also helped Treasury yields ease in the bond market. The S&P 500 pulled back to just 4% below its record.