I want to write a function that will find the Categoy[3].options[3].label and matches it to the letter "D". 

How do I iterate through the nested objects below to go through the TagCategory.options and search for the option that matches to the letter "D"? If it matches the letter "D", it should return true. 

```
"Category": 
[
  {
      "field": "A", 
      "options": [
          {"tag": "100", "value": "yes"}
      ], 
      "label": "Red"
  }, 

  {
      "field": "tanks", 
      "type": true, 
      "options": [
          {"tag_value": "4", "value": "4", "label": "A"}, 
          {"tag_value": "3", "value": "3", "label": "B"}, 
          {"tag_value": "2", "value": "2", "label": "C"}, 
          {"tag_value": "1", "value": "1", "label": "D"}, 
          {"tag_value": "5", "value": "5", "label": "E"}
      ], 
      "label": "Tanks"
  }
]

```