Final answer:
The question confuses the story of Percy Jackson with the mythological figure Perseus. Percy Jackson was given a magical pen, while Perseus received a reflective shield and winged sandals. The correct option is C.
Step-by-step explanation:
The magic gift Percy's father gave him to help on his quest was a magical pen, also known as Riptide, which transforms into a sword.
However, the question seems to mix Percy Jackson's story with that of the ancient Greek hero Perseus. In mythology, Perseus received several magical items to assist him, including a reflective shield from Athena and winged sandals from Hermes.
These items helped Perseus in his quest to defeat Medusa. On the other hand, Percy, from the modern fantasy series 'Percy Jackson & the Olympians', received a pen that turns into a sword for his adventures.