Answer:
Feliz
Step-by-step explanation:
The answer that doesn't complete the sentence is Feliz. This is because you cannot say tengo feliz because it means I have happy. You cannot say that. It's just not suitable.
But with the other options, you can use them with tengo.
Tengo quince años (I have fifteen years)
Tengo frío (I'm feeling cold)
Tengo hambre (im feeling hungry)