Task: Question Answering
Input (English): Question: There are 12 towns grouped in four zones with three towns per zone. It is intended to connect the towns with a telephone lines such that each every two towns are connected with three direct lines if they belong to the same zone, and with only one direct line otherwise. How many direct telephone lines are required ?

 Option A: 72

 Option B: 90

 Option C: 96

 Option D: 144

 Option E: 128
Output (English): Option B