Select from options: Continue writing the next sentence.

How to get vitamin d naturally 
Learn how the sun creates vitamin d. 
Sunlight is a form of radiation that has two forms, ultraviolet a (uva) and ultraviolet b (uvb) radiation. Your main source of vitamin d occurs when uvb radiation strikes your skin. When this happens, the first steps of vitamin d synthesis in your body is triggered.

Choose your answer from:
 -In addition, the most powerful blue rays that cause vitamin d are found in the sun. Your uvb radiation travels through your entire body including your skin and gets to the spot where you are prone to sunburn.;
 -Your skin reacts directly to uvb rays. You don't get the energy necessary to take any " sun-enhancing " steps yet.;
 -After this, the next steps occur in the liver and then the kidneys. Because the rest takes place inside the body, once the body is triggered, you no longer need to be exposed to uvb radiation.;
 -Ultraviolet a (uva) is the active radiation that is produced by the sun, but is not useful for biosynthesis. Instead, vitamin d is produced on the uva inner layer of your skin.;
Answer:
After this, the next steps occur in the liver and then the kidneys. Because the rest takes place inside the body, once the body is triggered, you no longer need to be exposed to uvb radiation.