What Was Themistocles's Interpretation of the Delphic Oracle's Advice to the Greeks

What was Themistocles's interpretation of the Delphic Oracle's advice to the Greeks to defend Greece with a wooden wall?

A) that they must build a wall around Athens
B) that they must build a large hollow wooden horse to invade Persia
C) that they must gather their warships to attack the Persian armada
D) that a defense of Greece was hopeless