While judging distance in Field Craft, some factors are responsible for overestimating the distance. Which of the following is not a relevant factor for overestimating ?

In Field Craft and Battle Craft (FC & BC), judging distance accurately is essential for fire discipline. Distances are overestimated (appearing further than they actually are) under the following conditions: 1. Light is bad (dusk, fog, or rain); 2. The sun is in the observer's eyes; 3. The object is small in relation to its surroundings; 4. The observer is in a prone position (lying down); 5. Looking across a valley or undulating ground.

Conversely, distances are underestimated (appearing closer than they actually are) when: 1. The light is bright or the sun is behind the observer (i.e., not in the observer's eye); 2. The object is large; 3. Looking across a flat surface like water or snow; 4. Looking uphill. Therefore, option A is a factor for underestimation, not overestimation.