The correct answer is Bangladesh.
Bangladesh is the most densely populated country in the world, with a population density of 1,252 people per square kilometer. This is more than twice the population density of India, the second most densely populated country in the world. The high population density of Bangladesh is due to a number of factors, including its small size, fertile land, and warm climate.
India is the second most populous country in the world, with a population of over 1.3 billion people. However, it is not the most densely populated country. India has a population density of 464 people per square kilometer. This is lower than the population density of Bangladesh, Pakistan, and the Maldives.
Pakistan is the third most populous country in the SAARC region, with a population of over 220 million people. It has a population density of 298 people per square kilometer. This is higher than the population density of India, but lower than the population density of Bangladesh.
The Maldives is the smallest country in the SAARC region, with a population of over 500,000 people. It has a population density of 1,123 people per square kilometer. This is the highest population density of any country in the SAARC region.