Which sentence in the excerpt below uses a hasty generalization?

many young people between the ages of 16 and 18 are involved in car accidents. in fact, about 37 percent of all car accidents involve at least one driver between the ages of 16 and 18, and if you include drivers up to the age of 21, the statistics are even worse. about 45 percent of all accidents involve at least one driver under the age of 21. this means that youngsters are reckless drivers.
clearly, it is time that we change the age at which a person can get a driver’s license. it is time that we make 21 the legal driving age. many young people will scream that this is unfair. they will claim that a job, an education, and a life would no longer be accessible to them. the truth is that without a car young people will find an alternative way of getting around. whether it means riding public transportation, riding with parents, or even old-fashioned walking, where there is a will, there is a way to get there.

The sentence ahtat uses a hast generalization is:

This means that youngsters are reckless drivers.

Explanation:

There are two different arguments to say this. The first one is that there is a very important amount of data here. We don't know how much was the population. The factor that makes this important is that maybe the teenage population is proportionally bigger than the rest of the driving ages. The second one is that just because 45% of all car accidents involved a teenager doesn't mean they are reckless drivers. Because using that same way of thinking 55% were adults above the age of 21 years old. Therefore, we could also assume adults above the age of 21 are more reckless than them. So the thesis is invalid.

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"