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Two American Black individuals come to you for genetic counseling and are concerned about their risks of having children with Sickle Cell disease. They know that the risk of being a carrier in that population is one in ten. Which ONE of the following most closely approximates their risk for having a child with Sickle Cell disease?

A)0
B)1 in 4
C)1 in 100
D(1 in 400
E) 1 in 2500
D.. 1 in 400
DD
D.
d..........
1/10*1/10*1/4=1/400