Final answer:
The score with the highest frequency is 21, as it appears 3 times in the given scores. The correct answer to the question is option A) 21.
Step-by-step explanation:
To determine the highest frequency in the table of quiz scores, we need to count how many times each score appears. We see the following scores:
- 21 appears 3 times
- 22 appears once
- 20 appears once
- 29 appears once
- 25 appears twice
- 27 appears once
- 26 appears once
Therefore, the score with the highest frequency is 21, which appears 3 times. The correct answer is option A) 21.