Final answer:
The outcome of the alliance between Athens and Thebes to resist Philip II's military takeover was that both cities honored the agreement but were defeated. The correct option is B.
Step-by-step explanation:
The outcome of the alliance between Athens and Thebes to resist Philip II's military takeover was option B) Both cities honored the agreement but were defeated.
In 338 BCE, the Macedonians under Philip II defeated the allied Greek army of Athens and Thebes at the Battle of Chaeronea. This defeat led to Philip's goal of uniting the Greek city-states under his leadership.
Please note that this alliance was not successful in resisting Philip II's military takeover. The correct option is B.