What is the minimum number of small squares that must be colored black so that a line of symmetry lies on the diagonal \overline{B D} of square A B C D ?
Answer Choices
A. 1
B. 2
C. 3
D. 4
E. 5
What is the minimum number of small squares that must be colored black so that a line of symmetry lies on the diagonal \overline{B D} of square A B C D ?
Answer Choices
A. 1
B. 2
C. 3
D. 4
E. 5