Statement (A) As one considers orbits with higher values of n in...

In hydrogen atom, potential energy of electron in $n$th orbit is given as $\mathrm{PE}=\frac{-K z e^2}{r}$ For higher value of $n, r$ increase because $r \propto n^2$. From eq (i), it is clear that for higher value of $n$, potential energy increases. Hence, statement (A) is correct. In thomson's model an atom is a spherical cloud of positive charges with electrons embedded in it. Hence, statement (B) is correct. According to Bohr's model an electron in an atom is located at a definite distance from the nucleus and is revolving with a definite velocity around it. According to heisenberg's uncertainty principle, it is impossible to determine the exact position and momentum of moving electron simultaneously. Therefore, Bohr's model of an atom is contradicted by heisenbergs uncertainty principle. The statement (C) is incorrect. Hence, option (b) is correct.