There are four organic compounds, P, Q, R and S. P is classed as an unsaturated hydrocarbon. Q burns, but is otherwise unreactive. R has a $\text{C--C}$ single bond together with a $\text{C{=}C}$ double bond. S undergoes addition polymerisation. Which of the compounds are alkenes?
- AP and R only
- BP, R and S
- CP, Q and S
- DQ, R and S