According to the passage, how was the immense power of the atom bomb experienced for the first time?

Referring directly to the second sentence of the provided passage: "द्वितीय महायुद्ध में एटम बम की शक्ति ने कुछ क्षणों में ही जापान की अजेय शक्ति को पराजित कर दिया।" (In the Second World War, the power of the atom bomb defeated the invincible power of Japan within a few moments). This clearly states that the initial realization of this immense power occurred through the sudden defeat and destruction of Japan's military might. Thus, option (A) is the correct choice.