Vitamin D Insufficiency Is Associated with Many Diseases Including Multiple

Vitamin D insufficiency is associated with many diseases including multiple sclerosis, breast and other cancers, bone diseases, tuberculosis. A variable which represents the vitamin D level (ng/ml) of a hospital patient is

A) a categorical variable.
B) a quantitative variable.
C) a nominal variable.
D) an ordinal variable.
E) an identifier variable.

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