Arthur writes down three two-digit integers. One is square, one is prime and one is triangular.  She uses the digits $$1$$, $$2$$, $$3$$, $$4$$, $$5$$ and $$6$$ exactly once each.  Which largest prime does he write? ． 
选项为:A:$$13 $$  B:$$23 $$  C:$$31 $$  D:$$41 $$  E:$$43$$  请回答其中一个选项.