Which of the following weapons can be used to deliver chemical warfare agents?

The correct response indicates that all the specified options can be utilized to deliver chemical warfare agents. This encompasses a broad range of munitions including bombs, shells, and rockets, each capable of dispersing chemical agents over a target area.

Bombs can be designed to release chemical agents upon detonation, maximizing the area affected by the chemical. Shells, typically used in artillery, can also be engineered to contain and release chemical agents, impacting a designated battlefield zone effectively. Rockets are yet another delivery system that can carry chemical warheads to designated targets, providing flexibility in range and deployment.

The versatility of these delivery systems illustrates the strategic considerations in employing chemical weapons, allowing military forces various options to impact their adversaries with these types of agents. Thus, recognizing that each of these weapon forms can serve the same purpose clarifies why "each of the above" is the appropriate choice.