Astatine, At, is positioned beneath iodine in Group $17$ of the Periodic Table. Which statement is most likely to be true?
- A$\text{AgAt}(s)$ reacts with an excess of dilute aqueous ammonia to form a solution of a soluble complex.
- BAstatine and $\text{KCl}(aq)$ react to form $\text{KAt}(aq)$ and chlorine.
- C$\text{KAt}(aq)$ and dilute sulfuric acid react to form $\text{HAt}(g)$.
- D$\text{NaAt}(s)$ and concentrated sulfuric acid react to form astatine.