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: Vivitar 2800 Automatic Electronic Flash
Product 2: Vivitar 728AF AutoFocus Zoom Electronic Flash for Canon EOS Camera

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: B