Each Correlation Between Vitamin D and Sun Exposure Is Accurate,except

Each correlation between vitamin D and sun exposure is accurate,except one.Which is the exception?

A) The body has the ability to produce adequate amounts of vitamin D from sunlight.
B) UV radiation penetrates uncovered skin and converts a precursor of vitamin D to vitamin D₃.
C) Sunscreen does not block the formation of vitamin D₃.
D) By the age of 70 years, the skin generally produces vitamin D at only half the level it did at the age of 20 years.