The paragraph focuses noticeably on the features of a good lecturer and it is our job to identify the main one/s the author emphasizes in the text.
Distracter A is too general, providing very little information about the features of a good lecturer and is therefore eliminated.
Distracter D, although providing information given in the text (‘Having both the experience to concentrate on the essence and the motivation to stimulate students’) focuses on information given solely at the very end of the paragraph, suggesting that perhaps it is an aspect of secondary importance to the subject.
In order to choose between distracters B and C, let us try to understand the message of the text: ‘Admired university lecturers…have a carefully planned and an inflexible developmental trajectory while their teaching methods and class requirements continuously adapt to contemporary themes… Distinguished lecturers differentiate between invulnerable resources and ephemeral themes’.
It seems as though a good lecturer has to be organized and adaptable (distracter C).
Although distracter B sounds correct, and even appears in the text, it is not as accurate as distracter C since it is quite general and fails to convey the main idea of the text.