The population density per square km in Punjab is approximately:

100
250
550
800

The correct answer is: c) 550

Punjab is a state in northwestern India. It has a population of over 28 million people and a land area of 50,362 square kilometers. This gives it a population density of approximately 550 people per square kilometer.

Option a) is incorrect because the population density of Punjab is much higher than 100 people per square kilometer.

Option b) is incorrect because the population density of Punjab is much higher than 250 people per square kilometer.

Option d) is incorrect because the population density of Punjab is much lower than 800 people per square kilometer.