For experiment 1, small pieces of limestone are placed into dilute hydrochloric acid at $40^\circ\text{C}$. The volume of carbon dioxide given off is measured at regular time intervals. The results are shown. Which changes produce the results shown in experiment 2?
- Alarge lumps, $40^\circ\text{C}$
- Bpowder, $40^\circ\text{C}$
- Cpowder, $60^\circ\text{C}$
- Dsmall lumps, $60^\circ\text{C}$