Final answer:
John Locke's assertion emphasizes skepticism in epistemology, indicating that we can be certain only of our own existence and that of God, which is answer C. Locke's empiricism asserts that knowledge stems from experience, contrasting with the idea of innate ideas, and supports the concept of a God-given moral order.
Step-by-step explanation:
The conclusion suggested by John Locke's assertion that the two surest things we can know of existing are ourselves and God aligns with his emphasis on the importance of skepticism, specifically questioning the certainty of all knowledge except the self and God. Therefore, the correct answer is:
C) Locke emphasized the importance of skepticism, questioning the certainty of all knowledge except the self and God.
Locke's position is derived from his significant contributions to empiricism. This epistemological view emphasized that knowledge comes from experience and sensory perception, as articulated in his notable work, An Essay Concerning Human Understanding. Locke argued against innate knowledge, suggesting that humans are born with minds like blank slates, tabula rasa, and acquire understanding through life experiences. Furthermore, Locke's belief in natural rights such as life, liberty, and property, and the social contract theory formed significant parts of his political philosophy, indicating his conviction in the inherent rationality and capabilities of individuals, and a God-given moral order.