the answer is B the comma in between open {and} and makes it feel more natural
Zeus was the god of the sky and ruler of the Olympian gods. He overthrew his father, Cronus, and then drew lots with his brothers Poseidon and Hades, in order to decide who would succeed their father on the throne. Zeus won the draw and became the supreme ruler of the gods, as well as lord of the sky and rain.
Reluctantly is the right answer
