You have chosen 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz, 'Preface to 'Principles of Philosophy'' by Ren Descartes and 'The Sign of Four' by Arthur Conan Doyle
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |