1. **State the problem:** We need to find the percentage of students who received an A grade and were instructed individually. 2. **Identify the relevant data:** From the table, the number of students with an A grade instructed individually is 10. 3. **Calculate the total number of students who received an A grade:** This is the sum of students instructed individually and in groups with an A grade: $$10 + 18 = 28$$. 4. **Calculate the percentage of students with an A grade instructed individually:** Use the formula for percentage: $$\text{Percentage} = \frac{\text{Number instructed individually}}{\text{Total number with A grade}} \times 100$$ Substitute the values: $$\frac{10}{28} \times 100 = \frac{10}{\cancel{28}} \times 100 = \frac{10}{\cancel{28}} \times 100 \approx 35.71\%$$ 5. **Interpret the result:** The percentage is approximately 36%, which corresponds to option C. **Final answer:** C. 36%