The correct option is 1 only because, over the past five years, India has consistently imported more edible oils than it has produced domestically, driven by rising demand and insufficient local supply. While the government has periodically adjusted customs duties on imported edible oils to stabilize prices or support local farmers, it does not maintain a blanket exemption from customs duties on all imported edible oils. This reflects the interdependence of domestic agricultural policies and international trade regulations, a key aspect of India's economic strategy to balance self-sufficiency with global market dynamics.