Answer:
d)trough
Step-by-step explanation:
The lowest turning period of a business series in which a contraction is known as Trough. Trough, later on, turns into expansion and this turning period is also termed as Recovery. The marketing cycle is the recurrent but extraordinary up-and-down changes in commercial enterprise, estimated by changes in real GDP. In fact, all contemporary industrialized prosperity like that of the United States continues substantial fluctuations in commercial activity over time.