The theories that explain the formation of 'Informal Groups' are to include which of the following?
1. Propinquity Theory
2. Similarity or Balance Theory
3. Displacement Theory
4. Need for achievement Theory
Choose the correct option from those given below:

A. 1 and 4 only

B. 1 and 2 only

C. 1, 2 and 3 only

D. 1, 2, 3 and 4 only

Answer: Option B