Weightlessness occurs in

Weightlessness occurs in the zero state of gravity, denoted by option [A]. In environments where gravitational forces are negligible, such as space, objects and individuals experience apparent weightlessness. This sensation occurs because there is no significant gravitational force acting on them, allowing them to float freely and experience a sensation of weightlessness. While weightlessness can also occur momentarily in free-fall situations when gravity decreases, such as during parabolic flights, sustained weightlessness primarily occurs in environments where gravitational forces are minimal or nonexistent, such as in the vacuum of space. In these conditions, objects and individuals experience a sensation of weightlessness, enabling unique scientific experiments and space exploration activities to be conducted with minimal interference from gravitational effects.