Uncontrolled airspace is A. Class G airspace. B. for flying VFR only. C. primarily for instrument flight operations.

The correct answer is A. Class G airspace.<br /><br />Uncontrolled airspace refers to airspace where air traffic control (ATC) services are not provided, and pilots are responsible for separating themselves from other aircraft. This type of airspace is typically found at lower altitudes and is designated as Class G airspace in the United States.<br /><br />Class G airspace is generally used for visual flight rules (VFR) operations, where pilots rely on visual references on the ground to navigate and avoid other aircraft. However, it is not exclusively for VFR operations, as instrument flight rules (IFR) operations can also be conducted in Class G airspace, provided the pilots have the necessary instruments and equipment.<br /><br />Option B is incorrect because Class G airspace is not exclusively for flying VFR. While VFR operations are common in Class G airspace, IFR operations can also be conducted there.<br /><br />Option C is also incorrect. Class G airspace is not primarily for instrument flight operations. While IFR operations can be conducted in Class G airspace, it is not specifically designated for that purpose.