A particular element has the following values for its first four ionization energies: 900, 1760, 14,850, and 21,000 kJ/mol. In what group of the periodic table does this element likely belong?
a) Group 1 (Alkali metals)
b) Group 2 (Alkaline earth metals)
c) Group 13 (Boron group)
d) Group 14 (Carbon group)