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Difficulty—
Ashton Embry's extensive research into the causes of Multiple Sclerosis and the Vitamin D connection have led him to a larger interest in Vitamin D and its effects on all aspects of human health.
A) causes of Multiple Sclerosis and the Vitamin D connection have led him to a larger interest in Vitamin D
B) cause of Multiple Sclerosis and the Vitamin D connection has led him to a larger interest in Vitamin D
C) causes of Multiple Sclerosis as well as the Vitamin D connection has led him to a larger interest in Vitamin D, including
D) cause of Multiple Sclerosis and the Vitamin D connections has led him to an interest in this vitamin
E) causes of Multiple Sclerosis and the Vitamin D connection has led him to a larger interest in this vitamin
OA E
Source: Economist GMAT
A) causes of Multiple Sclerosis and the Vitamin D connection have led him to a larger interest in Vitamin D
B) cause of Multiple Sclerosis and the Vitamin D connection has led him to a larger interest in Vitamin D
C) causes of Multiple Sclerosis as well as the Vitamin D connection has led him to a larger interest in Vitamin D, including
D) cause of Multiple Sclerosis and the Vitamin D connections has led him to an interest in this vitamin
E) causes of Multiple Sclerosis and the Vitamin D connection has led him to a larger interest in this vitamin
OA E
Source: Economist GMAT
