Which type of narrator has full knowledge of all characters, rather than just one character

A. third person limited

B. third person omniscient

C. naïve first person

C doesn't necessarily make sense. ''naive'' means the lack of experience/innocent. I doubt that they'd have full knowledge of all characters. They'd most likely know more about them/narrate more about their feelings and be oblivious to the others.

A. Not quite. Third person limited is well ... Limited. It doesn't necessarily cover all the bases of each and every characters' feelings or what they think. The other characters are merely presented in an external way, whilst the main character is mainly presented in internal, whereas we know more about him rather than the other characters, in which we only learn about them externally.

Omniscient means 'all knowing'. That's exactly what third person omniscient is. All knowing and knowledgeable of and to all of the characters feelings and such. Therefore B.