please explain

Bob sold 1,000 shares of YYC on September 10th of this year at a price of $10; the adjusted cost base on these shares is $12. On October 1st of this year, Bob acquired 1,000 shares of YYC at a price of $8 per share. How much of a capital loss can Bob claim based on these transactions involving YYC ? a) $2,000 b) $4,000 c) $0 d) $6,000