13 One of the identical twin brothers is adopted by a socio-economically rich family and the other by a poor family. After one year, which one of the following may be most likely observed about their IQ scores?
1. The boy with poor family will score greater than the boy with rich socio-economic family
2. socio-economic level does not affect the IQ score
3. The boy with rich socio-economic family will score greater than the boy with poor family
4. Both of them will score equally