Nov 15 (Reuters) - Canada’s main stock index fell on Monday, weighed by weakness in crude and gold prices, although upbeat economic data out of China offered some support. At 9:31 a.m. ET (14:31 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 35.13 points, or 0.16%, at 21,733.4. Reporting by Shashank Nayar in Bengaluru; Editing by Ramakrishnan M.