1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is

 [EAMCET (Med.) 1995; CPMT 1999] (a) 63 * 10 7 J        (b) 63 * 10 10 J        (c) 63 * 10 14 J       (d) 63 * 10 20 J