I think that The answer is b.
Your paragraph is perfect except that you should not capitalize the word "mythology".
A folktale is a type of traditional story that tries to explain something, or which is meant to help people behave well in the world. Such stories usually are fiction<span>-based with magical or supernatural elements, and they often are woven around talking animals, royalty, peasants or mythical creatures. Initially passed down through oral tradition, they were a major means of educating and entertaining prior to the development of printed materials and modern technologies, and they remain instrumental in preserving aspects of the culture in which they develop.</span>
Answer:
I guess you could go with " the feeling of achievement is better when you've worked hard"