Answer:
The compass in Journey to the Center of the Earth might be completely broken. Option C.
Explanation:
The compass was behaving erratically on their voyage. They realized that it was the electric currents that caused this. As they state in Chapter 43, "Then the disordered compass, thrown out of gear by the electric currents, confirmed me in a growing conviction." It was later discovered at the end of the novel that it was the fireball that struck the raft and the jolt of electricity that accident caused that now made the needle of the compass point the wrong way.
