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Answer: B
Explanation: Hope you have a great day, hopefully this is correct! :]
Based on the description provided, a dog whistle emits a sound that is specifically designed to be high-pitched and outside the range of human hearing. Therefore, the correct answer would be:
B. Able to be heard
The context clue here is that the sound is "only audible to dogs," implying that while humans cannot hear it, dogs can.
The term "able to be heard" fits this context because it indicates that the sound is perceivable by the intended audience (dogs), even though it is not within the hearing range of humans.