The theories that explain the formation of 'Informal Groups' are to include which of the following?a) Propinquity Theoryb) Similarity (or) Balance Theoryc) Displacement Theoryd) Need for achievement TheoryChoose the correct option from those given below:

The theories that explain the formation of 'Informal Groups' are to in

1.	The theories that explain the formation of 'Informal Groups' are to include which of the following?a) Propinquity Theoryb) Similarity (or) Balance Theoryc) Displacement Theoryd) Need for achievement TheoryChoose the correct option from those given below:
A.	and d) only
B.	and b) only
C.	a), b) and c) only
D.	a), b), c) and d)
Answer» C. a), b) and c) only