Oil prices rose about two per cent on Monday as traders weighed the impact of wars in the Middle East and Ukraine and extreme cold weather across North America on oil supply against a bullish US stock market signalled demand growth. Brent March crude futures rose $1.17, or 1.5pc, to $79.73 a barrel by 10:41 a.m. CST (1641 GMT). The front-month US West Texas Intermediate crude futures contrac