Helpppl!!! In 2011,Miami-Dade County had a population of about 2.55 million people and covered an area of about 5000 square kilometers. What was the approximate population density of Miami-Dade County in 2011? A) 5100 people per square kilometer. B)1960 people per square kilometer. C) 510 people per square kilometer. D) 196 people per square kilometer