U.S. stocks fell on Thursday, as Iranian strikes on two oil tankers sent crude prices surging toward $100 per barrel, further exacerbating inflation fears and sending investors fleeing equity markets. All three major U.S. stock indexes slid more than 1.5% in a broad selloff, with everything but energy and some defensive stocks suffering steep percentage losses. The S&P 500 notched its biggest three-day percentage drop in a month. Iran’s Supreme Leader Ayatollah Mojtaba Khamenei vowed to…