Given What You Know of the Inheritance Pattern of SCD,what

Given what you know of the inheritance pattern of SCD,what can be said of individual II-5?

A) He is a carrier because his mother was affected and his son was affected.
B) He is unaffected,and the mutant allele is passed from II-4 to their son.
C) His children with II-4 will all have a 50% chance of being affected (βˢβˢ) .
D) He is a carrier,and his children with II-4 will have a 50% chance of being affected (βˢβˢ) and a 50% chance of being a carrier (βᴬβˢ) .
E) He is a carrier,and his children with II-4 will have a 50% chance of being affected (βˢβˢ) and a 50% chance of being unaffected (βᴬβᴬ) .