Why should one cover with the left arm when armed?

Covering with the left arm when armed is primarily about maintaining readiness and efficiency in using a weapon, which is why the option highlighting anticipation of using the right hand for a weapon is correct. When an individual is armed, they typically hold their weapon in the right hand. Covering with the left arm allows for immediate and unhindered access to the firearm, ensuring that the person can quickly respond to any threats while also keeping the left side somewhat protected.

The action of covering with the left arm not only helps shield important areas of the body but also positions the individual in a better tactical stance. This approach helps create a natural balance between preparing for engagement and defending oneself against potential hazards. Efficient use of the left arm in this context allows for a more effective defensive and offensive posture in dynamic situations encountered while armed.