What defines a bomb?

A bomb is defined as an unpowered weapon that can be guided or unguided, which accurately describes option A. Bombs are designed to be dropped from aircraft and do not rely on their own propulsion systems to reach their target, distinguishing them from other types of munitions that may be powered. Guided bombs incorporate technology that allows for precision targeting, while unguided bombs follow a ballistic trajectory once released. This versatility is a key characteristic of bombs, making them distinct in military operations.

In contrast, powered aerial weapons aimed at moving targets typically characterize missiles, which have their own propulsion systems and guidance mechanisms. Specialized underwater explosives refer to devices designed for use in aquatic environments, which do not align with the traditional definition of a bomb as an aerial weapon. Small caliber projectiles fired from a gun are more accurately described as ammunition or rounds, which are different from bombs in terms of design and usage.