For each permutation $(a_1,a_2,\dots,a_{11})$ of the numbers $1,2,3,4,5,6,7,8,9,10,11$, we can determine at least $k$ of $a_i$s when we get $(a_1+a_3, a_2+a_4,a_3+a_5,\dots,a_8+a_{10},a_9+a_{11})$. $k$ can be at most ?

$ \textbf{(A)}\ 11 \qquad \textbf{(B)}\ 6 \qquad \textbf{(C)}\ 5 \qquad \textbf{(D)}\ 2 \qquad \textbf{(E)}\ \text{None}$
1. Let \( a_i + a_{i+2} = b_i \) where \( i = 1, 2, \dots, 9 \). We are given the sequence \( (a_1, a_2, \dots, a_{11}) \) which is a permutation of the numbers \( 1, 2, 3, \dots, 11 \). Therefore, the sum of all \( a_i \) is:
   \[
   a_1 + a_2 + \cdots + a_{11} = \frac{11 \cdot 12}{2} = 66
   \]

2. The sequence \( (b_1, b_2, \dots, b_9) \) is given by:
   \[
   b_1 = a_1 + a_3, \quad b_2 = a_2 + a_4, \quad b_3 = a_3 + a_5, \quad \dots, \quad b_9 = a_9 + a_{11}
   \]

3. Summing all \( b_i \):
   \[
   b_1 + b_2 + b_3 + \cdots + b_9 = (a_1 + a_3) + (a_2 + a_4) + (a_3 + a_5) + \cdots + (a_9 + a_{11})
   \]
   Notice that each \( a_i \) appears exactly twice except \( a_6 \), which does not appear in any \( b_i \). Therefore:
   \[
   b_1 + b_2 + \cdots + b_9 = 2(a_1 + a_2 + \cdots + a_{11}) - a_6 = 2 \cdot 66 - a_6 = 132 - a_6
   \]

4. From the above equation, we can solve for \( a_6 \):
   \[
   a_6 = 132 - (b_1 + b_2 + \cdots + b_9)
   \]

5. Next, we can determine \( a_4 \) and \( a_8 \) using the equations \( a_4 + a_6 = b_4 \) and \( a_6 + a_8 = b_6 \):
   \[
   a_4 = b_4 - a_6, \quad a_8 = b_6 - a_6
   \]

6. Similarly, we can determine \( a_2 \) and \( a_{10} \) using the equations \( a_2 + a_4 = b_2 \) and \( a_8 + a_{10} = b_8 \):
   \[
   a_2 = b_2 - a_4, \quad a_{10} = b_8 - a_8
   \]

7. Therefore, we can always determine \( a_2, a_4, a_6, a_8, a_{10} \). This means \( k \geq 5 \).

8. To check if \( k \) can be greater than 5, consider the sequences \( (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) \) and \( (3, 2, 1, 4, 7, 6, 5, 8, 11, 10, 9) \). Both sequences satisfy \( (a_1 + a_3, a_2 + a_4, a_3 + a_5, \dots, a_8 + a_{10}, a_9 + a_{11}) = (4, 6, 8, 10, 12, 14, 16, 18, 20) \). They have 5 common elements, indicating that \( k \neq 6 \).

The final answer is \( \boxed{5} \)