A student reacts strips of zinc with dilute sulfuric acid and records how long it takes to produce $100\,\text{cm}^3$ of hydrogen. The test is repeated under different conditions. The results are shown in the table. Which change in conditions would give the results shown in experiment 2?
- A1, 3 and 4 only
- B1 and 4 only
- C2 and 3 only
- D2 and 4 only