The most likely option to cause an issue among the ones provided is:
C. Radioactive deposit
1. A family farm is unlikely to cause harm unless there are specific hazardous materials involved or improper disposal practices.
2. A parking lot might contribute to pollution through vehicle emissions, but it is less likely to have a significant impact compared to the other options.
3. Radioactive deposits can pose serious health and environmental risks due to the emission of ionizing radiation, which can lead to long-term health effects and environmental contamination.
4. Pavement runoff can carry pollutants into water bodies, causing water pollution, but it is generally considered less harmful compared to radioactive deposits.