12) B
The easiest way to do this is by using the symbols and matching it with the other cards. 
The only pair that can be formed is the third card (third in the top row) and the fifth card (first in the second row). 
The third card has Tin written at the top, Saturn in the middle and the symbol for Gold and Sun at the bottom. 
The fifth card has Jupiter (which is equivalent to Tin) written at the top, symbol for Saturn and Lead in the middle and Gold written in the bottom.  

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