FindNearest.cs

private GameObject GetNearestGameObject(List<GameObject> gameObjectsToConsider)
{
  float smallestDistance = Mathf.Infinity;
  GameObject nearestGameObject;

  foreach(var go in gameObjectsToConsider)
  {
    var distance = Vector3.Distance(transform.position, go.transform.position);
    if (distance < smallestDistance)
    {
      smallestDistance = distance;
      nearestGameObject = go;
    }
  }
  return nearestGameObject;
}