Instruction: Analyze the titles of Product 1 and Product 2 to determine if they are similar, if they will be purchased or viewed together, and choose the corresponding option.

Input:
Product 1: Full Speed Ahead FSA Hammer Threadless Heavy Duty Bicycle Headset
Product 2: ODIER Bike Bicycle Full Carbon Headset Spacer Stem Spacer 5 Pcs 1-1/8 20 10X2 5 3mm for MTB Road Bike Santa Cruz Haro Mongoose GT Giant Trek Cannondale Scott Yeti Schwinn Bikes (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: A