Explanation:

- Manifest function: This is the intended and recognized consequence of an action or process. For introducing a new automatic machine, the manifest function would be increasing production efficiency.

- Latent function: This is an unintended and unrecognized (but still positive or neutral) consequence. For example, learning new technical skills might be a latent function.

- Latent dysfunction: This refers to unintended and unrecognized negative consequences. If the machine leads to workers feeling alienated or losing their jobs, and this outcome was not anticipated, it's a latent dysfunction.

- Manifest dysfunction: This is an intended and recognized negative consequence. Introducing a new machine is unlikely to be intended to harm workers—it is not a manifest dysfunction.

Correct Answer: Option 3 - Latent dysfunction (The negative impact on workers, like job loss, is unintended and not directly recognized.)