下列离子在碱性溶液中能大量共存，并且溶液为无色透明的是

A．Na⁺、Cu²⁺、SO、OH^―

B．K⁺、Ba²⁺、Cl^―、NO₃^―

C．Na⁺、Cl^―、Ca²⁺、MnO₄^―

D．Na⁺、HCO₃^―、SO₄^2―、Cl^―

A successful life is a life______challenges are met and difficulties overcome.

A．which

B．where

C．that

D．what