A sculpture that moves or has kinetic parts is called:

A sculpture that moves or has kinetic (motion-based) parts is called a mobile. The term was coined by Marcel Duchamp in 1931 to describe the hanging, balanced sculptures of Alexander Calder, which move freely in response to air currents or touch. Mobiles are a form of kinetic sculpture, meaning sculpture that incorporates actual physical movement.

The other options describe different sculpture categories. A static sculpture is one that does not move at all, which is the opposite of what the question describes. A relief sculpture is a work that projects from a flat background surface (such as a wall), and is classified by its depth (low relief, high relief). An environmental sculpture is a large-scale work designed to interact with or transform a surrounding space or landscape, but it is not defined by movement.

The key word in the question is "moves or has kinetic parts," which points directly to a mobile.