—I am going to the old people's home to celebrate Mrs. Green's______ birthday.
A:ninty-ninth
B:ninety-ninth
C:ninety-nineth
①积极履行代表职责
②掌握民情,集中民智,反映民意
③做到权为民用,利为民谋,情为民系
④只能反映民意,不能参与国家和地方的重大事情的重大决策