Explanation:

To find the HCF of fractions, consider the following process:

- First, find the HCF (Highest Common Factor) of the numerators: 11, 9, 16, and 10.

- These don’t have any common factors other than 1.

- Next, find the LCM (Least Common Multiple) of the denominators: 25, 20, 15, and 33.

- Prime factorization gives us:

- 25 = $5^2$

- 20 = $2^2\times 5$

- 15 = $3\times 5$

- 33 = $3\times 11$

- The LCM is $2^2\times 3\times 5^2\times 11=3300$.

- The HCF of the fractions is therefore $\frac{1}{3300}$.

- Your selected answer: Option 1 - $\frac{1}{3300}$.

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