Which of the following statements is correct?

a- High per capita income and low population growth make rich states or rich social groups get richer
b- Low incomes and high population growth reinforce each other to make poor states and poor groups get poorer.

Both statements are correct.

High per capita income and low population growth make rich states or rich social groups get richer, whereas low incomes and high population growth reinforce each other to make poor states and poor groups get poorer.