$Statement 1$: Over-population has become a serious problem in the developing countries.
$Statement 2$: It does not exhaust natural resources, causes unemployment and pollution.

• A
  Statement $1$ is True, Statement $2$ is True; Statement $2$ is correct explanation for Statement $1$.
• B
  Statement $1$ is True, Statement $2$ is True; Statement $2$ is not correct explanation for Statement $1$.
• C
  Statement $1$ is True, Statement $2$ is False.
• D
  Statement $1$ is False, Statement $2$ is True.