Walgreens Boots Alliance Inc WBA.O rose following better-than-estimated fourth-quarter results. By Caroline Valetkevitch NEW YORK, Oct 13 (Reuters) - U.S. stocks surged to close more than 2% higher on Thursday, as technical support and investors covering short bets drove a dramatic rebound from a selloff earlier in the day. The market initially dropped after data showed the headline consumer price index rose at an annual pace of 8.2% in September, compared with an estimated 8.1% rise.