Instruction: Given the title of two products, predict if the two products are similar, if the two products will be purchased or viewed together. Answer only from the options.

Input:
Product 1: Alpine PDR-V75 5 Channel Digital Amplifier - 100W RMS x 4 + 350W RMS x 1
Product 2: Alpine PDX-V9, 5-Channel Extreme Power Density Digital Amplifier

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