Which of the following professional (s) are more likely to run the risk of a permanent change in their cell's DNA? 1. Researchers using carbon-14 isotope 2. X-ray technician 3. Coal miner 4. Dyer and Painter Select the correct answer by using the codes given below:

1. The question asks which professionals are more likely to risk a permanent change (mutation) in their cell's DNA. 2. Statement 1: Researchers using Carbon-14 isotope. C-14 is a weak beta emitter. While radioactive, the risk depends heavily on the quantity used and safety precautions. Standard research use poses a relatively low risk compared to other sources. 3. Statement 2: X-ray technician. X-rays are ionizing radiation, which is a known mutagen capable of causing DNA damage. Technicians working regularly with X-ray equipment face occupational exposure risks, necessitating protective measures. This group has a significant risk. 4. Statement 3: Coal miner. The primary risk for coal miners is respiratory diseases like pneumoconiosis from coal dust inhalation, not typically direct DNA mutation risk in the same sense as radiation or chemical mutagens. 5. Statement 4: Dyer and Painter. Some dyes and chemicals used in painting can be mutagenic or carcinogenic, posing a risk of DNA damage through chemical exposure. 6. Comparing the risks, the X-ray technician (ionizing radiation) faces a well-established risk of DNA damage. Depending on the specific substances used, Dyers and Painters might also face risks from chemical mutagens. The risk for C-14 researchers is generally lower, and for coal miners, the primary recognized occupational hazard is different. Option (A) highlights the most definite and direct risk listed.