passing function to class

 public class option
 {
     public UnityEvent onclick = new UnityEvent();
 
     public string name;
 }

With this code I'm able to pass a funtion to the class but only functions from the same class:

 public class objScript : MonoBehaviour
 {
     public List<option> defaultOptions = new List<option>();
 
     void yey()
     {
         Debug.Log("YAY");
     }
     void Start()
     {
 
         opti = new option();
         opti.name = "Delete";
         opti.onclick.AddListener(yey);
         defaultOptions.Add(opti);
 }}

This won't work:

 public class objScript : MonoBehaviour
 {
 
     public List<option> defaultOptions = new List<option>();
 
     void Start()
     {
         options opt = GetComponent<options>();
 
         option opti;
 
         opti = new option();
         opti.name = "Delete";
         opti.onclick.AddListener(opt.delete); //options.delete is defined
         defaultOptions.Add(opti);
 }}

ERORR: ArgumentException: Value does not fall within the expected range.

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