The correct answer is: B. Interstate supply and Imports.
Integrated Goods and Services Tax (IGST) is a tax levied on inter-state supply of goods and services. It is also levied on imports of goods and services. IGST is a composite tax, which means that it includes both Central GST (CGST) and State GST (SGST). The rate of IGST is 12%.
Intrastate supply of goods and services is not subject to IGST. It is subject to CGST and SGST. The rates of CGST and SGST are 5% and 5% respectively.
Exports of goods and services are also not subject to IGST. They are subject to a special tax called Export Duty. The rate of Export Duty varies depending on the type of goods or services being exported.
A. Interstate Supply only is incorrect because IGST is also levied on imports.
C. Exports is incorrect because exports are not subject to IGST.
D. Intrastate sales is incorrect because intrastate supply of goods and services is subject to CGST and SGST, not IGST.