Air Quality Index 201-300 comes under the category ofa.Moderateb.Satisfactoryc.Poord.Good

The Air Quality Index (AQI) categorizes air quality levels based on the concentration of pollutants in the air. An AQI range of 201-300 signifies "Poor" air quality. In this category, health effects are likely, and members of sensitive groups may experience more serious health effects.

Given the options provided:
a. Moderate
b. Satisfactory
c. Poor
d. Good

The correct answer is: c. Poor

This means that the air quality poses a higher risk, particularly for vulnerable populations such as children, the elderly, and people with pre-existing health conditions. It is advisable for everyone to limit prolonged outdoor exertion during this range of air quality.