$P$ is a compound that, when it burns in an excess of oxygen, produces only carbon dioxide and water. A sample of $2.20\ \text{g}$ of $P$ contains $1.20\ \text{g}$ of carbon and $0.20\ \text{g}$ of hydrogen. If $P$ is added to a solution of sodium carbonate, gas bubbles are observed. What is $P$?
- A$\text{CH}_3\text{CHO}$
- B$\text{CH}_3\text{CO}_2\text{H}$
- C$\text{CH}_3\text{COCH}_2\text{CH}_2\text{OH}$
- D$\text{CH}_3\text{CH}_2\text{CH}_2\text{CO}_2\text{H}$