Which option identifies the significance of the suggestion in the following scenario? A soil conservationist works with a rancher to determine how to alternate rangeland used as pasture. One suggestion pertains to reducing grazing during certain times of the year when grazing is available.

The plants contain toxins during certain months.
The plants are more vulnerable during certain months.
The plants do not have as much nutrition during certain months.
The plants release more carbon and phosphorus during certain months.