from ,begin bold,Spritacular,end bold,
paragraph 1,A flash of lightning, and then—something else. High above the storm, a crimson figure blinks in and out of existence. If you saw it, you are a lucky witness of a sprite, one of the least-understood electrical phenomena in Earth's upper atmosphere. But if you caught it on camera, your photo could contribute to a ground-breaking scientific discovery.
paragraph 2,NASA's newest citizen science project, Spritacular (pronounced ,begin italics,sprite-tacular,end italics,), leverages the power of crowdsourcing to advance the study of sprites and other Transient Luminous Events, or TLEs. TLEs include a range of electrical phenomena that occur above thunderstorms and produce brief flashes of light. The new citizen science project aims to connect professional scientists with members of the public who would like their camerawork to contribute to scientific studies. . . .
paragraph 3,Sprites occur at some 50 miles (80 kilometers) altitude, high above thunderstorms. They appear moments after a lightning strike—a sudden reddish flash that can take a range of shapes, often combining diffuse plumes and bright, spiny tendrils. Some sprites tend to dance over the storms, turning on and off one after another. Many questions about how and why they form remain unanswered.
(from "Spritacular: NASA's New Citizen Science Project to Capture Elusive Upper Atmospheric Electrical Phenomena on Camera" by Miles Hatfield, NASA's Goddard Space Flight Center, Greenbelt, MD)
Question
What does the description of TLEs in paragraph 3 ,begin emphasis,most,end emphasis, clearly suggest about them?
Answer options with 4 options
1.
TLEs can be mistaken for lightning.
2.
TLEs are a relatively common occurrence.
3.
TLEs can emerge quickly and seem to move.
4.
TLEs are a consistent presence in thunderstorms.