Final answer:
Macbeth fears when he hears the news that Birnam Wood is moving towards his castle, realizing that the witches' prophecy is coming to fruition.
Step-by-step explanation:
Macbeth's reaction to the news that Birnam Wood is moving is d) Fear. In the play 'Macbeth' by William Shakespeare, one of the witches' prophecies to Macbeth is that he shall remain unvanquished until 'Great Birnam Wood to high Dunsinane Hill Shall come against him.' When he learns that the opposing army is advancing towards his castle at Dunsinane with boughs cut from Birnam Wood, thus making it appear as though the wood itself is moving, Macbeth realizes that the prophecy is coming true and is seized by fear.