Attachment itself is not labelled a “sin” in the technical sense of a moral offence, but it is the root of karmic bondage. True or false
True.
In Jainism, attachment (rāga / moha) is not usually described as a “sin” in the narrow moral sense, but it is one of the main causes of karmic bondage. Bondage arises because attachment ties the soul to worldly objects, relations, and pleasures, strengthening karma.
So the statement is true in the Jain context.