Producers, including Alcoa Inc (NYSE: AA - news ) and Rusal (HKSE: 0486-OL.HK - news ) , have recently blasted China's swelling exports as a factor behind plunging primary aluminium prices.
Take context from the input text and decide on the accurate relationship between 'Alcoa' and 'aluminium' from the options provided.
Options: distributed by, brand, position held, product/material produced