What is one of the fire control principles regarding enemy threats?

Massing the effects of fire is a critical fire control principle because it allows for the concentration of firepower on the most significant threats posed by the enemy. By focusing multiple weapons systems or units on a single target or area, units can achieve overwhelming force and increase the likelihood of neutralizing the enemy effectively. This approach maximizes the impact of available fire resources and minimizes the potential for enemy retaliation, enhancing overall battlefield effectiveness.

In contrast, the other options do not align with effective fire control principles. Destroying the least threatening targets first does not prioritize immediate threats, which could lead to greater risk for friendly forces. Minimizing weapon usage may not be advisable in critical situations where overwhelming firepower is necessary to secure a tactical advantage. Engaging with the enemy is often vital for maintaining initiative and controlling the battlefield, so avoiding engagement altogether can be detrimental to operational success. Thus, massing effects is the most strategic and effective principle in addressing enemy threats.