Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D.

Having read the above passage, choose the right answer to the following question (choices are more prevalent or less prevalent ):


Caucasian Americans have lighter skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among Caucasian Americans is more prevalent or less prevalent than among other Americans? 

