Multi-choice problem: Continue writing the next sentence in this paragraph:

How to care for madagascar periwinkle
Purchase a plant from the local nursery or garden centre.
Alternatively, grow the plant from seed in spring to obtain really good flowering plants.
This plant can also be propagated by cuttings.

Choose from: a). Use a soil-based compost in the pot. Place the madagascar periwinkle in bright light or direct sunlight.; b). Buy healthy periwinkle peppers. Cut the peppers open with a sharp knife.; c). Select a new planting spot with soft soil and easy to walk well. Madagascar periwinkle grows best in safe sites and under cool (not too warm) soil.; d). The cutting process is likely to require you to remove the plant later for transplanting. Care for your plants when they're still young.;
a).