Concerning the prophecy in Isaiah 7:14 about a virgin conceiving, which of the following interpretations is MOST accurate regarding its immediate historical context?

A It solely refers to a future event concerning Jesus' birth, with no relevance to Isaiah's time. B It primarily addresses the political crisis of Isaiah's time, promising a sign of God's deliverance through a child to be born soon after. C It is a symbolic representation of the end times, unrelated to any specific historical event. D It is a prophecy concerning the downfall of Assyria, revealed through the birth of a royal heir.