R is a solid substance. When hydrochloric acid is added, R fizzes. R also reacts with hot aqueous sodium hydroxide and releases a gas that turns red litmus blue. What is the formula of R?
- A$\text{NH}_4\text{CO}_3$
- B$(\text{NH}_4)_2\text{CO}_3$
- C$(\text{NH}_4)\text{HCO}_3$
- D$(\text{NH}_4)_2\text{SO}_4$