The psychological factors affecting the language learning of a child include: (a) interest of a child in language; (b) parents' encouragement and motivation; (c) environment in which child is placed; (d) reward and punishment. Choose the correct alternative.

1. Only (a) and (b)
2. Only (a), (b) and (c)
3. Only (b), (c) and (d)
4. Only (a), (c) and (d)