Ectrodactyly, also known as lobster claw syndrome, is a recessive disorder in humans. If a phenotypically unaffected

Question:

Ectrodactyly, also known as "lobster claw syndrome," is a recessive disorder in humans. If a phenotypically unaffected couple produces an affected offspring, what are the following probabilities?
A. Both parents are heterozygotes.
B. An offspring is a heterozygote.
C. The next three offspring will be phenotypically unaffected.
D. Any two out of the next three offspring will be phenotypically unaffected.