Read this excerpt from a passage.
"What is the appropriate age for a new driver to earn a license? Is age 16, the age used by many states, the way to go? Or should the minimum age requirement be 18 years old? Recently, there has been much debate about what the driving age should be.
"When the first automobile was invented in 1886, there was excitement about what this new machine meant for the future of travel, both near and far. In 1900, cars were considered luxury items, and only 8,000 were owned in the United States. Currently, over 253 million cars are driven on American roads. As the automobile became the main form of transportation in the United States, regulations about who could operate the cars soon followed."
Which of the following subjects will be compared in the rest of the passage?
early automobiles and modern automobiles
the concept of luxury items and the concept of necessity items
a minimum driving age of sixteen and a minimum driving age of eighteen
historical transportation forms and modern transportation forms