What will happen to the mountain of the Lord's house?

The notion that the mountain of the Lord's house will be established on the top of the mountains reflects a prophecy of exaltation and prominence. In the context of Isaiah, this imagery signifies not only the physical elevation of God's dwelling place but also its spiritual significance and authority. The "mountain" symbolizes the temple, which is regarded as a center of worship and divine presence among the people.

Establishing the mountain of the Lord's house on the top of the mountains conveys the ultimate victory of God's kingdom and the acknowledgment of His sovereignty by all nations. This prophecy points toward a future where God's presence and His ideals will be revered above all else, attracting people from every nation to Zion to learn His ways and embrace His teachings.

The other choices suggest negative outcomes or diminishment, which do not align with the hopeful and uplifting message found in Isaiah's prophecy about the destiny of the Lord's house. The correct answer encapsulates the grand vision of restoration, unity, and worship that is at the heart of the prophetic message in Isaiah.