The correct answer is A. flame.
A flame is a small, hot fire that burns with a bright light. It is often used as a symbol of hope or perseverance. In the context of the question, the flame of liberty represents the ideals of freedom and democracy. These ideals are important to many people, and they can be difficult to maintain during difficult times. However, through perseverance and hard work, we can keep these ideals alive.
The other options are not as relevant to the question. A lamp is a device that provides light, but it does not have the same symbolic meaning as a flame. A goal is something that we strive to achieve, but it does not necessarily represent something that is worth fighting for. And light is simply a form of energy, but it does not have the same emotional resonance as a flame.
In conclusion, the correct answer to the question is A. flame.