The correct option is D 10 ASEAN members and 6 other nations
Regional Comprehensive Economic Partnership comprises of 10 ASEAN Member States and ASEAN’s free trade agreement (FTA) partners viz. Australia, China, India, Japan, Korea and New Zealand. It is considered as an alternative to the other important multilateral treaty named Trans-Pacific Partnership (TPP). The establishment of the RCEP is in the strategic interest of China. It is the largest FTA China has ever negotiated on.