In the simple model of risk, which statement best describes the relationship between risk, toxicity, and time?

In the simple model of risk, which statement best describes the relationship between risk, toxicity, and time?

• A. Exposure is optional
• B. Risk increases with both toxicity and time
• C. Risk is independent of time
• D. Toxicity determines risk alone

Answer: (B)

In a simple risk model, risk grows with how toxic something is and with how long you’re exposed. Longer exposure accumulates more dose over time, so risk increases as time passes. At the same time, a more toxic substance can cause harm more easily, raising risk for any given exposure duration. Because exposure is the avenue for risk, you still need exposure to have risk, and time matters because it changes the accumulated dose. Therefore, the statement that risk increases with both toxicity and time best captures how these factors interact.

In a simple risk model, risk grows with how toxic something is and with how long you’re exposed. Longer exposure accumulates more dose over time, so risk increases as time passes. At the same time, a more toxic substance can cause harm more easily, raising risk for any given exposure duration. Because exposure is the avenue for risk, you still need exposure to have risk, and time matters because it changes the accumulated dose. Therefore, the statement that risk increases with both toxicity and time best captures how these factors interact.