What will help against enemy fire and observation?

The correct choice focuses on the principles of cover and concealment in military tactics. Cover refers to protection from enemy fire, such as walls, vehicles, or natural formations that can shield personnel or equipment from being hit. Concealment involves hiding one's position, making it difficult for the enemy to observe or target friendly forces. Together, these two concepts are essential to ensure the safety of troops, maintain tactical advantages, and minimize casualties in combat situations.

Open terrain, while it may seem navigable, actually exposes forces to both enemy observation and fire, providing little to no protection. Concealed positions can offer some degree of safety, but without proper cover, they are still vulnerable to direct attacks. Bright uniforms are counterproductive; they attract attention and make it easy for the enemy to spot and target troops, undermining the effectiveness of tactical movement and positioning. Thus, cover and concealment are vital for enhancing survival and operational effectiveness on the battlefield.