Answer
See the answer below.
Work Step by Step
$\Delta E=-Rhc(1/n_f^2-1/n_i^2)$
a) $-0.980.Rhc$
b) $-0.0074.Rhc$
c) $-0.75.Rhc$
A releases more energy, thus having the bigger frequency (ii) and the shortest wavelength (iii).
B releases the least amount of energy (i).
