Given below are two statements :
Statement I : The pentavalent oxide of group-15 element, ${\mathrm{E}}_2{\mathrm{O}}_5$, is less acidic than trivalent oxide, ${\mathrm{E}}_2{\mathrm{O}}_3$, of the same element.

Statement II : The acidic character of trivalent oxide of group 15 elements, ${\mathrm{E}}_2{\mathrm{O}}_3$, decreases down the group.
In light of the above statements, choose most appropriate answer from the : options given below :