The height of a simple Watt governor running at a speed ' \(\mathrm{N}\) ' is proportional to

(a) \(\mathrm{N}\)

(b) \(\frac{1}{\mathrm{~N}}\)

(c) \(\mathrm{N}^{2}\)

(d) \(\frac{1}{\mathrm{~N}^{2}}\).