Final answer:
The three key Renaissance ideas are Humanism, Individualism, and Secularism, reflecting a shift in thought to emphasize human achievements, the importance of the individual, and a move towards secular appreciation of human endeavors.
Step-by-step explanation:
The three key Renaissance ideas as believed in their viewpoints are Humanism, Individualism, and Secularism. Humanism is the belief that humans can achieve great things and emphasizes the human capacity for achievement, which became evident in the arts, sciences, and politics. Individualism put focus on the importance of the individual and the self, marking a contrast against the collective identities emphasized by institutions like the Church. Secularism is seen in the gradual shift away from purely religious worldviews towards a more secular understanding of the world, which allowed for the exploration of subjects outside of the traditional religious canon.
Humanism was embodied by the works and ideas of scholars and poets like Francesco Petrarca, emphasizing humanity's potential for achievement. Individualism led to recognizing artists as unique creators of works with personal value. Secularism appeared in the patronage of arts by the church, which sometimes depicted themes outside the strictly religious scope, and was also evident in the humanist writings that combined classical philosophy with Christianity.
The incorrect options included a blend of ideas such as rationalism and conservatism, which are attributed more to the Enlightenment than the Renaissance; nationalism and collectivism, which are not particularly Renaissance ideals; and religious orthodoxy and mysticism, which are in fact counter to Renaissance thinking.