In reaction R, $2000$ molecules of $\text{CH}_2{=}\text{CH}_2$ combine to produce only one molecule X. $2000\ \text{CH}_2{=}\text{CH}_2 \rightarrow X$ Which terms are used to describe reaction R, $\text{CH}_2{=}\text{CH}_2$ and X?
- Areaction R: addition; $\text{CH}_2{=}\text{CH}_2$: monomer; X: polymer
- Breaction R: addition; $\text{CH}_2{=}\text{CH}_2$: polymer; X: monomer
- Creaction R: substitution; $\text{CH}_2{=}\text{CH}_2$: monomer; X: polymer
- Dreaction R: substitution; $\text{CH}_2{=}\text{CH}_2$: polymer; X: monomer