Most of the damage from thermal effects tends to occur in

The intensity of thermal effects, such as heat radiation from a fire, decreases exponentially with distance from the source, a principle described by the inverse-square law. This physical law dictates that the energy per unit area is inversely proportional to the square of the distance. As a result, the highest heat flux and the most severe damage to both personnel and equipment are concentrated in the immediate vicinity of the event. The potential for significant harm diminishes rapidly as distance increases.

B. While effects may be felt over a wide range, the most significant and destructive damage is highly localized at close range.
C. Damage at a large distance is significantly less severe due to the rapid dissipation of thermal energy.
D. A correct answer is provided; thermal damage is demonstrably a close-range phenomenon.

- API Recommended Practice 580, Risk-Based Inspection, 3rd Edition, November 2016, Section 11.3.2.2: This section discusses flammable consequences, where thermal radiation effects are a key component and are most intense near the source.

- Crowl, D. A., & Louvar, J. F. (2019). Chemical Process Safety: Fundamentals with Applications. 4th Edition. Prentice Hall. Chapter 7 discusses thermal radiation and its decay with distance.