What hydrogen like ion has the wavelength difference between the first lines of Balmer and Lyman series equal to 59.3 nm? $R_H = 109678 cm^{-1}$

Question

$(a)\;Mg^{2+}\qquad(b)\;Na^{1+}\qquad(c)\;Li^{+2}\qquad(d)\;K^{2+}$