The decorations for her long awaited homecoming were finally up the ribbons dancing in the gentle breeze which object or concept is personified here

Ribbons

Explanation:

A figures of speech is also referred to as figurative language and it can be defined as a deliberate and specific construction or use of language by writers, authors or speakers to create a special effect in their speech or literary work (write-ups).

In English literature, the main purpose of the figures of speech (figurative language) is to convey more information and enable the readers or listeners have a deeper understanding of a literary work. Some examples of the figures of speech (figurative language) used in literature are simile, paradox, metaphor, apostrophe, hyperbole, personification, etc.

Personification involves intentionally attributing life, human characteristics (qualities) or feelings and emotions to inanimate objects i.e non-living things.

In this scenario, the decorations for a long awaited homecoming were finally up; the ribbons dancing in the gentle breeze. Thus, the object or concept which is personified is "ribbon" because it is an inanimate object (a non-living thing) and it is being described to be dancing.

Typically, inanimate objects (non-living things) such as balloons, tables, pencils, screwdrivers, etc., do not possess the ability to dance.

the underlined phrase is an example of : understatment