U.S. oil prices rose to a four-month high of $60 a barrel Friday, and posted their biggest quarterly gain since 2009 as global supplies tighten and risk appetite grows amid rising stock markets. –West Texas Intermediate futures, the U.S. oil benchmark, ended 1.4% higher at $60.14 a barrel on the New York Mercantile Exchange. Prices ended the January to March period 32% higher. That’s the strongest quarterly percentage increase since the second quarter of 2009, although the fourth quarter of last year saw oil’s biggest quarterly…