China’s foreign exchange reserves rose for a fifth straight month in March, with the increase exceeding expectations, as growing optimism about the prospects for a US-China trade deal offset concerns over slowing economic growth.Chinese reserves, the world’s largest, rose by nearly US$9 billion in the month to US$3.099 trillion, its highest since August, according to central bank figures released on Sunday.Economists polled by Reuters had expected the reserves to rise by US$5 billion to US$3…