B
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Sickle cell anemia is a genetic disease caused by an autosomal recessive gene. If each parent carries one sickle cell allele, what are the chances that their child will have sickle cell anemia?

### Choices:
A. no chance
B. one in four
C. two in four
D. three in four

### Answer:
