Irrelevant sentences are those sentences that have no use in the passage they are put or inserted in. In other words, irrelevant sentences are those sentences that can be removed without changing the meaning or intention of the author or passage.
In the given passage, the speaker talks about the declining importance of Math and Science in the British education system. Amidst the failing high school curriculum, the inclusion of the statement <u><em>"In the short term, it may be necessary to make use of the universities' resources"</em></u> is unnecessary as it does not add or take away any meaning or importance to the whole passage.
Thus, the correct answer is option B (sentence III).
