How many positive integers which divide $5n^{11}-2n^5-3n$ for all positive integers $n$ are there?

$ 
\textbf{(A)}\ 2
\qquad\textbf{(B)}\ 5
\qquad\textbf{(C)}\ 6
\qquad\textbf{(D)}\ 12
\qquad\textbf{(E)}\ 18
$
To determine how many positive integers divide \( f(n) = 5n^{11} - 2n^5 - 3n \) for all positive integers \( n \), we need to find the common divisors of \( f(n) \) for any \( n \).

1. **Check divisibility by 2:**
   \[
   f(n) = 5n^{11} - 2n^5 - 3n
   \]
   Since \( 5n^{11} \), \( 2n^5 \), and \( 3n \) are all multiples of \( n \), and \( 2n^5 \) is even, \( f(n) \) is always even. Therefore, \( f(n) \) is divisible by 2.

2. **Check divisibility by 5:**
   Using Euler's theorem, \( n^5 \equiv n \pmod{5} \):
   \[
   f(n) = 5n^{11} - 2n^5 - 3n \equiv 5n - 2n - 3n \equiv 0 \pmod{5}
   \]
   Therefore, \( f(n) \) is divisible by 5.

3. **Check divisibility by 9:**
   Using Euler's theorem, \( n^6 \equiv 1 \pmod{9} \) for \( n \) coprime to 9:
   \[
   f(n) = 5n^{11} - 2n^5 - 3n \equiv 5n^5 - 2n^5 - 3n \equiv 3n^5 - 3n \equiv 3n(n^4 - 1) \pmod{9}
   \]
   Since \( n^4 \equiv 1 \pmod{3} \), \( n^4 - 1 \equiv 0 \pmod{3} \):
   \[
   3n(n^4 - 1) \equiv 0 \pmod{9}
   \]
   Therefore, \( f(n) \) is divisible by 9.

4. **Check divisibility by 113:**
   We need to check if \( 113 \) divides \( f(n) \) for all \( n \). Let's test with \( n = 3 \):
   \[
   f(3) = 5 \cdot 3^{11} - 2 \cdot 3^5 - 3 \cdot 3
   \]
   Calculate \( 3^{11} \pmod{113} \):
   \[
   3^{11} = 177147 \equiv 15 \pmod{113}
   \]
   Calculate \( 3^5 \pmod{113} \):
   \[
   3^5 = 243 \equiv 17 \pmod{113}
   \]
   Therefore:
   \[
   f(3) \equiv 5 \cdot 15 - 2 \cdot 17 - 9 \equiv 75 - 34 - 9 \equiv 32 \pmod{113}
   \]
   Since \( 32 \not\equiv 0 \pmod{113} \), \( 113 \) does not divide \( f(n) \) for all \( n \).

Since \( f(n) \) is divisible by \( 2 \), \( 5 \), and \( 9 \), the divisors of \( f(n) \) are the divisors of \( \text{lcm}(2, 5, 9) = 90 \). The number of positive divisors of 90 is:
\[
90 = 2 \times 3^2 \times 5
\]
The number of divisors is:
\[
(1+1)(2+1)(1+1) = 2 \times 3 \times 2 = 12
\]

The final answer is \(\boxed{12}\)