Final answer:
Headphones at test centers depend on the location and testing policies, hence the answer is C) Depends on the location.
Step-by-step explanation:
The availability of headphones at test centers with computers is not a standardized practice. Therefore, the correct answer to whether headphones are allowed to hear the questions as you read them during a knowledge test is C) Depends on the location. It can vary based on the rules and accommodations provided by different test centers. Some may allow the use of headphones, especially if they cater to individuals with special needs who may benefit from auditory assistance, while others may not provide this option. Furthermore, it could also depend on the nature of the test itself, with some tests allowing the use of headphones due to their design or the testing policies.