To answer this question, we need to determine which chapter in Thirukkural contains the phrase "Thupparku thuppaya thuppaki thuparkku thuppaya thoovum mazhai."
The correct answer is B) 2.
This phrase is found in Chapter 2 of Thirukkural, which is titled "அறன் வலியுறுத்தல்" (Arathupal).
Chapter 2 focuses on the importance of righteousness and the consequences of committing wrongful acts. The phrase "Thupparku thuppaya thuppaki thuparkku thuppaya thoovum mazhai" emphasizes the notion that violence begets violence and that if one engages in wrongful acts, they will face the consequences.
Therefore, the correct answer is B) 2.