Final answer:
A male client with a BMI of 33.9 kg/m² and a waist circumference of 99 cm is classified as having Obesity class I with a high risk for obesity-related diseases.
Step-by-step explanation:
Based on the presented data, a male client with a body mass index (BMI) of 33.9 kg/m² and a waist circumference of 99 centimetres falls into the category of Obesity class I. According to the Centers for Disease Control and Prevention (CDC), an adult with a BMI between 30 and 39.9 kg/m² is considered to have obesity class I. This classification is accompanied by a high risk for obesity-related diseases such as coronary heart disease, type 2 diabetes, hypertension, and other conditions. Although not measured by BMI, the client's waist circumference also indicates central obesity, which is particularly associated with an increased risk of health complications, making option c (Obesity class I; high) the correct classification and disease risk level.