Which of the following should be avoided when shooting a firearm?

Shooting at water or hard surfaces should be avoided when shooting a firearm because the bullet could ricochet off the surface and potentially cause harm to anyone in the surrounding area. Additionally, it is important to always follow proper safety precautions when handling a firearm, such as wearing hearing protection and using a firearm rest to help stabilize the gun. It is also important to maintain proper form and follow through after the shot to ensure accuracy and control of the firearm. Therefore, options A, C, and D are all recommended safety measures that should not be avoided when shooting a firearm.