The pH of the space of thylakoid of isolated chloroplast is decreased and then transferred in the dark to a pH-8 solution. The result would most likely be:
| I. | The isolated chloroplasts will make ATP. |
| II. | The Calvin cycle will be activated. |
| III. | Cyclic photophosphorylation will occur. |
| 1. | Only I |
| 2. | Only I and II |
| 3. | Only I and III |
| 4. | Only II and III |