Which of the following statements correctly reflects the meaning of ALARA?

• A. Attenuation Limits And Reaches Acoustic?
• B. Always Limit And Reduce Acoustics
• C. As Low As Reasonable Attainment
• D. As Low As Reasonable Achievable

Answer: (D)

ALARA is the principle of keeping exposure as low as reasonably achievable, balancing the level of reduction with economic and practical factors. The best statement captures that idea directly: As Low As Reasonable Achievable. It emphasizes that exposure should be minimized, but not at any cost; improvements are pursued as long as they are reasonably practicable.

The other phrasings miss the established terminology or make no sense in context. One option uses a meaningless combination of words, another swaps in “acoustics” which isn’t what ALARA concerns, and the remaining option uses “attainment” instead of the correct “achievable.”