The correct answer is C. Insurance.
Trade in services is the exchange of services between countries. Services are intangible activities that are produced for a fee or another form of compensation. They include a wide range of activities, such as banking, insurance, tourism, and education.
Computer hardware is a physical good that is produced and sold. Textiles are also physical goods that are produced and sold. Aerospace is a sector of the economy that includes the manufacture and sale of aircraft, spacecraft, and related equipment.
Therefore, the only option that is a service is C. Insurance.