Yolanda is a Latina female who is experiencing stereotype threat while taking a physics exam. Research suggest that the effects of stereotype threat can be reduced by: 

a. Raising Yolanda's self-esteem through positive feedback 

b. Reassuring Yolanda that the test does not show group differences 

c. Showing Yolanda that other groups perform worse 

d. Giving Yolanda additional tutoring in other material she finds challenging