Final answer:
Morbid obesity is classified by having a BMI of 40 or higher.
Step-by-step explanation:
Morbid obesity is classified by having a Body Mass Index (BMI) of 40 or higher. According to the information provided, a BMI of 45% and above falls within the range of morbid obesity. Therefore, the correct classification for morbid obesity is option D, 45% and above.