Final answer:
Advice and deeds must reflect beauty and consistency, embodying the ideals of harmony and proportion as emphasized by philosophers like Plato and Aristotle.
Step-by-step explanation:
The correct answer to the question is that d) advice and deeds should be beautiful and consistent. This is in line with historical and philosophical views on aesthetics and ethics, where beauty, consistency, and order are not only valued in physical appearance but also in actions and thoughts, reflecting a harmony between outward deeds and internal virtues. Ancient philosophers like Plato regarded beauty as an objective quality tied to harmony and proportion, while Aristotle emphasized the importance of propriety and consistent character. Within this context, our actions and opinions should mirror such ideals, being carefully considered and displaying a consistent, becoming character, free from impetuosity or frivolity.