$ a_{i} \in \left\{0,1,2,3,4\right\}$ for every $ 0\le i\le 9$. If $ 6\sum _{i \equal{} 0}^{9}a_{i} 5^{i} \equiv 1\, \, \left(mod\, 5^{10} \right)$, $ a_{9} \equal{} ?$

$\textbf{(A)}\ 0  \qquad\textbf{(B)}\ 1  \qquad\textbf{(C)}\ 2  \qquad\textbf{(D)}\ 3  \qquad\textbf{(E)}\ 4$
1. We start with the given equation:
   \[
   6 \sum_{i=0}^{9} a_i 5^i \equiv 1 \pmod{5^{10}}
   \]
   where \(a_i \in \{0, 1, 2, 3, 4\}\) for \(0 \leq i \leq 9\).

2. Notice that \(5^i \equiv 0 \pmod{5^{i+1}}\) for any \(i\). This means that each term \(a_i 5^i\) for \(i < 9\) will be divisible by \(5^{i+1}\) and thus will not affect the modulo \(5^{10}\) significantly except for the highest term \(a_9 5^9\).

3. We can rewrite the sum as:
   \[
   6 \left( a_9 5^9 + \sum_{i=0}^{8} a_i 5^i \right) \equiv 1 \pmod{5^{10}}
   \]

4. Since \(5^9\) is a large power of 5, the term \(a_9 5^9\) will dominate the sum modulo \(5^{10}\). We need to find \(a_9\) such that:
   \[
   6 a_9 5^9 \equiv 1 \pmod{5^{10}}
   \]

5. To solve for \(a_9\), we first simplify the equation modulo \(5\):
   \[
   6 a_9 \cdot 5^9 \equiv 1 \pmod{5^{10}}
   \]

6. Since \(5^9\) is a multiple of \(5\), we can reduce the equation modulo \(5\):
   \[
   6 a_9 \cdot 0 \equiv 1 \pmod{5}
   \]
   This simplifies to:
   \[
   0 \equiv 1 \pmod{5}
   \]
   which is a contradiction. Therefore, we need to consider the equation modulo \(5^{10}\) more carefully.

7. We need to find the multiplicative inverse of \(6 \cdot 5^9\) modulo \(5^{10}\). Since \(5^9\) is a large power of 5, we can consider the inverse of 6 modulo 5:
   \[
   6 \equiv 1 \pmod{5}
   \]
   Thus, the inverse of 6 modulo 5 is 1.

8. Therefore, we need \(a_9\) such that:
   \[
   a_9 \cdot 5^9 \equiv 1 \pmod{5^{10}}
   \]

9. Since \(a_9\) must be an integer between 0 and 4, we test each value:
   - For \(a_9 = 0\):
     \[
     0 \cdot 5^9 \equiv 0 \pmod{5^{10}}
     \]
   - For \(a_9 = 1\):
     \[
     1 \cdot 5^9 \equiv 5^9 \pmod{5^{10}}
     \]
   - For \(a_9 = 2\):
     \[
     2 \cdot 5^9 \equiv 2 \cdot 5^9 \pmod{5^{10}}
     \]
   - For \(a_9 = 3\):
     \[
     3 \cdot 5^9 \equiv 3 \cdot 5^9 \pmod{5^{10}}
     \]
   - For \(a_9 = 4\):
     \[
     4 \cdot 5^9 \equiv 4 \cdot 5^9 \pmod{5^{10}}
     \]

10. We see that \(4 \cdot 5^9 \equiv 1 \pmod{5^{10}}\) is the only value that satisfies the equation.

The final answer is \(\boxed{4}\).