Answer:
Option C
Step-by-step explanation:
A reflective essay is when you reflect on a past experience in your life that made an impact on you in a way that would make others feeling some sort of satisfaction by reading your experience. In this case discussing a "time where you met a childhood hero", or option C is a great topic for a reflective essay. Since how childhood hero's usually a huge impact on a person's life because of the influence have they had on that particular person, an idol/role model some would say.
It's not option A because explaining the concept of time and space travel is more of an informative essay than a reflective, since how you aren't reflecting on anything but informing the audience on the concept of space travel.
It's not option B because you are again writing an informative essay, on why teenagers should get part time jobs.
It's not option D simply because this is an argumentative essay, where they're two sides of the spectrum the people who believe the internet should be made available for free, and the people who believe the internet shouldn't be made available for free.
Your answer is option C.
Hope this helps.