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: HP 16GB 2RX4 PC3L-12800R-11 DDR3 1600 (PC3 12800) Memory Kit 713985-B21
Product 2: HP 8 GB 1RX4 PC3-14900R-13 Memory Kit 731761-B21

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