Which of the following best expresses the author's main point? A. Philosophy's overriding interest in basic human questions is a legacy primarily of the work of Kant. B. Philosophy was deeply involved in the seventeenth-century warfare between science and religion. C. The set of problems of primary importance to philosophers has remained relatively constant since antiquity. D. The status of philosophy as an independent intellectual pursuit is a relatively recent development. E. The role of philosophy in guiding intellectual speculation has gradually been usurped by science.