Steadiness returned to the stock market after two days of volatility. Investors weighed some strong company earnings, falling oil prices, and a tepid hiring survey. ADP said private businesses added 139,000 jobs in February, but the US issues its more comprehensive jobs report Friday. Stocks plunged Monday but surged to a record high Tuesday as tensions in Ukraine flared, then eased. Energy stocks were the big losers Wednesday, falling as the price of oil dropped a second day as the threat of sanctions on Russia appeared to recede. Exxon Mobil fell 2.8%; it plans to cut capital spending 6% this year, but production will rise 2%.