Final answer:
Timothy co-authored two books of the New Testament with Paul, namely the First and Second Epistles to the Thessalonians.
Step-by-step explanation:
The correct answer is B) Two. Timothy is traditionally credited with co-authoring two books of the New Testament with Paul. These are the First and Second Epistles to the Thessalonians, which were co-written with Silvanus (Silas).
While Timothy is mentioned in several other epistles attributed to Paul, the specific contribution of writing with Paul is clearly associated with the Thessalonian letters. It's important to note that the Bible does not provide explicit details about the extent of his contribution to these texts.