Need help please. It' s about recount main topic of the text. ..No link, will report...thank you. Nearly everyone has seen a plane or a hot air balloon fly overhead. Imagine, however, looking up at the sky and seeing something like never before—a large disc spinning with blinking lights. This was the scene near Roswell, New Mexico, on July 7th, 1947. The event remains a mystery to this day.

Based on the first paragraph, how can you recount the main topic of this text?
a) Nearly everyone has seen a plane or a hot air balloon fly overhead.
b) The strange events that happened in Roswell, New Mexico, in 1947 have finally been explained.
c) The strange events that happened in Roswell, New Mexico, in 1947 have never been explained
d) This was the scene near Roswell, New Mexico, on July 7th, 1947. The event remains a mystery to this day.