Instruction: Evaluate the titles of Product 1 and Product 2, then choose the option that best describes the relation between the two products.

Input:
Product 1:  Polk Audio CSW155 Subwoofer (Black)
Product 2: Theater Solutions SUB8S 250 Watt Surround Sound HD Home Theater Slim Powered Active Subwoofer (Black)

Options:
A: Users who buy product 1 may also buy product 2.
B: Users who view product 1 may also view product 2.
C: The product 1 is similar with the product 2.
Answer: C