Many people think that a large amount of investment in basic research seems to have little effect, because applied technology directly affects production. However, the development of applied research requires the backing of basic theoretical research. Pure theoretical research may not see any usefulness for the time being. But it is not certain that it will not bring great benefits in the future. What are the most likely assumptions for the above argument? ['There is no need to invest money for purely theoretical research because it has no practical purpose.', 'Time lag between the discovery of a new phenomenon and the practical use for which it was developed.', 'Comparatively speaking, we should focus on investing in applied science and technology research.', 'The current education system is not conducive to purely theoretical research.']