Final answer:
The best phrase to describe imitating movement without significance is 'D) Meaningless imitation of movement', indicating a lack of deeper purpose in the copied actions.
Step-by-step explanation:
The phrase that best characterizes the concept of imitating movement without significance is D) Meaningless imitation of movement. This phrase indicates that the movements are being mimicked or copied without any deeper purpose or significance.
In contrast, phrases such as 'Purposeful replication of actions' and 'Meaningful mirroring of gestures' imply that there is a specific intent or meaning behind the actions, and 'Conscious duplication of gestures' suggests an aware, deliberate replication of movements with possible significance.