Given What You Know of the Inheritance Pattern of SCD

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) His children with II-4 will have a 50% chance of being carriers (β^Aβ^S) .
C) His children with II-4 will all have a 50% chance of being affected (β^Sβ^S) .
D) A and B are correct.
E) A, B, and C are correct.