A nuclide has a decay constant of 4.28 x 10^-4 h^-1. If the activity of a sample is 3.14 x 10⁵ s^-1, how many atoms of the nuclide are present in the sample?

(a) 2.64 x 10¹²;

(b) 7.34 x 10⁸;

(c) 2.04 x 10⁵;

(d) 4.40 x 10¹⁰;

(e) None of these.