All the answers are nations except Qing Dynasty. I think China should be acceptable, but even if you disagree, Manchu should be accepted, since the dynasty was from Manchuria, which is at least a geographical location.
Oman and Afghanistan were both British protectorates. Some Nepalese territory was taken away by the British during or after the Anglo-Nepalese war and given back later.
The methodology for this quiz seemed awfully vague. I tried North Vietnam, South Vietnam, Sikkim, etc before realizing that it meant the entire country had to be conquered. I liked the concept, but I think it would benefit from a little clarification.