Read the passage carefully and give the answer of question given below. A little girl was learning a history lesson with her governess. All the morning she had been reading it over and hearing it explained by her governess, but no good came of either the reading or the teaching. The governess went over the lesson several times, explained the meaning, and for the last time, asked her pupil to read it over. After due time had been given, the girl was examined as to her knowledge of the lesson, but not a single answer could she give correctly. The governess lost patience with her, and threatened to punish her unless she could state where a certain treaty was signed.
Which of the following correctly expresses the meaning of lost patience with her?

Options

A. The inability of the governess to endure further the girl's failure to answer
B. The governess lost her enthusiasm to teach the girl
C. The governess felt that the girl cannot be taught the lesson
D. The governess felt that she was not good enough to teach the girl