Final answer:
In 5 years following a windstorm, the forest clearing will likely exhibit small trees and shrubs, indicating progress towards the original forest structure through secondary succession.
Step-by-step explanation:
After a windstorm has caused a disturbance in a forest by blowing down large trees, a process known as secondary succession begins. Initially, the area will experience rapid growth of sun-loving plants and pioneer species. Within 5 years, it is likely that the clearing will feature small trees and shrubs, which are intermediate species. These species will gradually lead to the development of a more mature forest ecosystem over time, eventually restoring it to a climax community resembling its previous state prior to the disturbance, although this can take well over a century.
Therefore, the best prediction for what the area would look like in 5 years is option 3) The forest will have small trees growing in the clearing, showing progressive growth towards the original forest structure.