a b c d

b

$F = \frac{mv^2}{r} = \frac{k}{r}$ $ v = \sqrt \frac{k}{m}$ $ L = mvr = \frac{nh}{2\pi} $ $ r = \frac{nh}{2\pi mv}$ $\text{Since v is a constant } r \propto n$ $ T_n = \frac{1}{2} mv^2$  $T_n \text{is independent of }n$