The correct answer is B. Transcending the conventions of society by living in solitude.
Step-by-step explanation:
Henry David Thoreau was an American writer that belonged to the transcendentalism movement; this movement supported the idea purity is in the individual and nature while society was corrupt. One of the works from Thoreus that supports this idea is "Walden" because this non-fictional book explains the way Thoreau spends around two years living in a cabin near to Walden pond and through this experience of solitude and connection with nature, and himself he reaches some purity that makes him transcend to understand better society. According to this, the main point of this book is the solitude to understand society or "transcending the conventions of society by living in solitude".