Final answer:
According to the WHO, overweight is defined as a BMI of 25 to 29.9 kg/m², and obesity is a BMI greater than 30 kg/m².
Step-by-step explanation:
The definition of overweight and obesity by the World Health Organization (WHO) are specific thresholds of body mass index (BMI). Overweight is defined as a BMI of 25 to 29.9 kg/m², and obesity is considered to be a BMI greater than 30 kg/m². Therefore, the correct answer is b) Overweight: BMI ≥ 25, Obesity: BMI ≥ 30.