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In which sentence is the underlined phrase an adjective phrase?

The best examples of her artistry were featured in the gallery show.

She has been painting on cardboard for at least a decade.

She has been painting on cardboard for at least a decade.

The best examples of her artistry were featured in the gallery show.

The underlined phrase "of her artistry" is an adjective phrase in the sentence "The best examples of her artistry were featured in the gallery show."