Final answer:
The correct capitalization for the book title is option a) "The Adventures of Tom Sawyer".
Step-by-step explanation:
The correct capitalization for the book title is option a) "The Adventures of Tom Sawyer". In title capitalization, important words such as nouns, pronouns, verbs, adjectives, and adverbs are capitalized. In this title, the definite article 'The' and the proper noun 'Tom Sawyer' are capitalized, while the preposition 'of' is not. Additionally, 'Adventures' is capitalized as it is an important word in the title.