Five different integers are selected from 1 to 6 and one integer is placed into each of the five squares shown.
The integers are placed so that the sum of the three integers in the vertical column is 7 , and the sum of the three integers in the horizontal row is 11 . Which integer does not appear in any square?
Answer Choices
A. 3
B. 4
C. 2
D. 6
E. 5