In $ xy \minus{}$plane, there are $ b$ blue and $ r$ red rectangles whose sides are parallel to the axis. Any parallel line to the axis can intersect at most one rectangle with same color. For any two rectangle with different colors, there is a line which is parallel to the axis and which intersects only these two rectangles. $ (b,r)$ cannot be ?

$\textbf{(A)}\ (1,7) \qquad\textbf{(B)}\  (2,6) \qquad\textbf{(C)}\  (3,4) \qquad\textbf{(D)}\   (3,3) \qquad\textbf{(E)}\ \text{None}$
To solve this problem, we need to analyze the given conditions and determine which pair \((b, r)\) cannot satisfy the conditions.

1. **Condition Analysis**:
   - Any parallel line to the axis can intersect at most one rectangle of the same color.
   - For any two rectangles of different colors, there is a line parallel to the axis that intersects only these two rectangles.

2. **Testing Each Option**:
   - **Option (1, 7)**:
     - One blue rectangle and seven red rectangles.
     - It is possible to arrange these such that no two rectangles of the same color are intersected by a parallel line, and there exists a line that intersects one blue and one red rectangle.
     - Example:
       ```
       b
       r
       r
       r
       r
       r
       r
       r
       ```
     - This configuration satisfies the conditions.

   - **Option (2, 6)**:
     - Two blue rectangles and six red rectangles.
     - It is possible to arrange these such that no two rectangles of the same color are intersected by a parallel line, and there exists a line that intersects one blue and one red rectangle.
     - Example:
       ```
       b
       b
       r
       r
       r
       r
       r
       r
       ```
     - This configuration satisfies the conditions.

   - **Option (3, 4)**:
     - Three blue rectangles and four red rectangles.
     - It is possible to arrange these such that no two rectangles of the same color are intersected by a parallel line, and there exists a line that intersects one blue and one red rectangle.
     - Example:
       ```
       b
       b
       b
       r
       r
       r
       r
       ```
     - This configuration satisfies the conditions.

   - **Option (3, 3)**:
     - Three blue rectangles and three red rectangles.
     - It is possible to arrange these such that no two rectangles of the same color are intersected by a parallel line, and there exists a line that intersects one blue and one red rectangle.
     - Example:
       ```
       b
       b
       b
       r
       r
       r
       ```
     - This configuration satisfies the conditions.

3. **Conclusion**:
   - Since all the given options (1, 7), (2, 6), (3, 4), and (3, 3) can satisfy the conditions, none of these pairs can be the answer.
   - Therefore, the answer is \(\boxed{E}\).