An example of third person omniscient would be "Sarah felt very lonely after her brother went to college, but her brother was excited to go to college." Third person omniscient is when the narrator knows all of the characters feelings and it uses words like "he, she, hers, his, he said, she felt" and other words like that. First person would use words like "mine, I felt, I" You did not post the responses to the question so I hope this was helpful. But just know that the correct answer should have a bunch of characters feelings and should use words such as "hers, his, she," Also third person LIMITED means the author/narrator knows only one persons thoughts.
To make it easier for people to answer your question, you should separate the questions from the answers, because I can't understand where the choices are and what the questions are.