Given below are two statements:
Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is \( 3 \).
\( [\mathrm{Sc^{3+}},\, \mathrm{Ti^{3+}}] \), \( [\mathrm{Mn^{2+}},\, \mathrm{Cr^{2+}}] \), \( [\mathrm{Cu^{2+}},\, \mathrm{Zn^{2+}}] \) and \( [\mathrm{Ni^{2+}},\, \mathrm{Ti^{4+}}] \)
Statement II: The \( \mathrm{Th^{4+}} \) is the strongest reducing agent among \( \mathrm{Th^{4+}} \), \( \mathrm{Ce^{4+}} \), \( \mathrm{Gd^{3+}} \) and \( \mathrm{Eu^{2+}} \).
In the light of the above statements, choose the correct answer from the options given below:
