Creamy Carrot Salad

2 boxes sugar free orange Jell-O
1 1/2 cups boiling water
3/4 cup diet Sprite or Sierra Mist
1 cup shredded carrots
1 (15 ounce) can crushed pineapple, drained
1 carton sugar free pina colada yogurt
1/2 cup chopped nuts (optional)

Mix Jell-O and boiling water. Add soda and mix well. Stir in carrots and pineapple. Refrigerate for one hour just to cool. Stir in yogurt and nuts. Refrigerate until set.