Final answer:
The deity with the almighty headache in the myth is Zeus, during the birth of Athena, making option B: The Birth of Athena the correct answer.
Step-by-step explanation:
The myth that involves a deity having an almighty headache is the birth of Athena, which is option B: The Birth of Athena. According to Greek mythology, Athena sprang fully grown and armored from the forehead of Zeus after he experienced a tremendous headache. Hephaestus, the god of blacksmiths, struck Zeus's head with an axe, prompting the emergence of the goddess of warfare and wisdom. This imagery has been depicted in various ancient Greek artworks, including the frieze on the Parthenon, where the gods react to Athena's dramatic birth from Zeus's head. Thus, the correct answer is B: The Birth of Athena.