What scientist used to determine the early history of the earth

Susan is planting her garden and choosing plants at the local plant nursery. she tells the clerk that she wants to plant perennials in her front garden bed. how often is susan expecting the plants that she chooses to germinate and flower? a. sprout this year and need to be replanted b. sprout every year for two years c. sprout every year, year after year d. grow into larger, permanent trees and shrubs