Researchers Have Studied Several Nutrient Interventions Aimed at Relieving Depression

Researchers have studied several nutrient interventions aimed at relieving depression in older adults.They found that these interventions ________.

A)  may or may not be effective. 
B)  are never effective. 
C)  are mildly effective for women, but not men. 
D)  are greatly effective for both men and women. 
E)  may worsen depression in very old individuals.