Action movies are among the generous I have benefited enormously from 3D effects which explains this tendency

A. It is much safer to use visual effects in many cases.
B. Action movie stars often do not like actually doing stunts.
C. It is more expensive to produce special effects on screen.
D. Action movies typically have the most unusual backgrounds.

A. It is much safer to use visual effects in many cases.

The statement you've provided describes the impact and benefit of 3D effects in action movies. The use of 3D effects and visual effects (VFX) in action movies is primarily due to safety considerations, cost-effectiveness, and the ability to create spectacular visuals that may not be possible to achieve through practical stunts or real-world settings alone. The safety of cast and crew is paramount, and utilizing visual effects allows for the creation of dangerous and high-intensity action sequences without putting anyone at risk.

Option A addresses the issue of safety, which is a key reason why many movies, particularly action films, opt for visual effects. The other options, while they might have some relevance in other contexts, are not directly explained by the statement regarding the benefits of 3D effects. Option B hints at a possible reason but does not directly relate to the benefits of 3D visual effects. Option C is incorrect because 3D and other visual effects can sometimes be more cost-effective than practical effects, especially for large-scale or highly dangerous sequences. Option D does not specifically relate to the safety or practical benefits of using 3D effects.