Which type of art was mostly composed of portable objects in Celtic heritage?

The correct answer relates to the diverse forms of portable art that emerged in Celtic heritage, which indeed encompassed sculptures, manuscripts, and stone carvings.

Celtic art is known for its intricate designs and motifs, often expressed through various mediums that allowed for portability. Sculptures, such as small carvings or figurines, were often made from materials like wood or stone that could be easily transported. Manuscripts, particularly illuminated texts, were created on vellum or parchment, making them lightweight and mobile. Additionally, stone carvings often included portable objects like decorative stone stones that could serve both functional and aesthetic purposes.

This encompasses all three forms mentioned in the options, highlighting the Celtic civilization's creativity and adaptability in art. Each type played a significant role in the expression of their cultural identity, while also being practical enough to be transported and shared.