The gaseous compound $Z$ breaks down when heated. The diagram shows Boltzmann distributions for $Z$ at two different temperatures, $P$ and $Q$. The lines $X$ and $Y$ show the activation energies for the decomposition of $Z$ with and without a catalyst. At the higher temperature and with a catalyst present, which curve and which line represent the decomposition of $Z$?
- Ahigher temperature: $P$, catalyst present: $X$
- Bhigher temperature: $P$, catalyst present: $Y$
- Chigher temperature: $Q$, catalyst present: $X$
- Dhigher temperature: $Q$, catalyst present: $Y$