11.  


B
I
K
H


Answer

 Option

In each row of the diagram, the numerical values of the letters add up to 26.

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12.  


B
F
D
E


Answer

 Option

In each row, add the numerical value of the left and right hand letters together and write the letter with the reverse alphabetical value in the centre.

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13.  


M
N
O
P


Answer

 Option

In each row, letters follow the alphabetic sequence, in steps of 4 letters each time for the first row, 5 letters for the second, then 6, 7 etc.

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14.  


J
K
L
M


Answer

 Option

In each row, the product of the left and right hand numbers equals the sum of the numerical values of the three letters.

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15.  


M
N
O
P


Answer

 Option

In each segment of the diagram are a pair of letters, one of which is the same distance from the start of alphabet as the other is from the end.

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