Final answer:
Timothy is mentioned as a co-sender in some of Paul's letters, but he is not traditionally credited with writing any books of the Bible. Therefore, the answer to how many books of the Bible Timothy wrote with Paul alone is none.
Step-by-step explanation:
The question asks about the authorship of biblical texts, specifically the contributions made by Timothy to the letters written with Paul. No books of the Bible are traditionally attributed solely to Timothy, but he is mentioned as a co-sender in some of Paul's letters. However, Timothy himself is not credited with writing any books of the Bible independently or with Paul alone. Among the Pauline epistles, two are addressed from both Paul and Timothy to the churches, these are 2 Corinthians and Philippians, but they are not considered to be written by Timothy. Therefore, the answer to the question 'How many books of the Bible did Timothy write with Paul alone?' is none, but since none was not an option provided in the question, this cannot be a definitive answer to the multiple choice format given. To clarify, the letters ascribed to Paul that mention Timothy are considered Paul’s letters, and not joint authorship.