Non-verbal communication is mostly which of the following?

Non-verbal communication is mostly involuntary, contextual and symbolic.

Statement 3, involuntary, fits because much of it, like expressions, happens without conscious control.

Statement 4, contextual, fits because its meaning depends on the situation around it.

Statement 5, symbolic, fits because gestures and signs stand for meanings by convention.

Describing it as descriptive is wrong, as it suggests rather than plainly describes.

Describing it as aggressive is wrong, as it is not by nature hostile.