**Core Concept**
The Body Mass Index (BMI) is a widely used measurement to assess an individual's weight status relative to their height. It is calculated by dividing the person's weight in kilograms by the square of their height in meters.

**Why the Correct Answer is Right**
To calculate BMI, we use the formula: BMI = weight (in kg) / height (in meters)². In this case, the person's height is 1.72 meters and weight is 89 kilograms. Plugging these values into the formula, we get: BMI = 89 kg / (1.72 m)². This simplifies to BMI = 89 kg / 2.9584 m², which equals approximately 30.1 kg/m². This value falls within the obese category according to the WHO BMI classification.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
* **Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that BMI is not a perfect measure, as it does not account for muscle mass or body composition. However, it remains a useful tool for assessing weight status in a clinical setting.

**Correct Answer: D. 30.1 kg/m²**