Which Couple Would Be Eligible to Apply to Internationally Adopt

Which couple would be eligible to apply to internationally adopt a child from China?

A) Dave and John live in Canada and have been married for three years.Dave works as an investment banker and John is a lawyer.They want to adopt a child together.
B) Allison and William live in Canada and have been married for five years.They are financially stable, they own their own home, and they are healthy.Their attempts to have a child using in vitro fertilization were not successful.
C) Aidan and Katrina live in Canada and have been married for 12 years.Their one child, Olivia, died at age five from leukemia.They have decided to adopt a girl.
D) Allan and Martha live in Canada and have been married for six years.They have not been able to have a biological child.Her family doctor had advised Martha to lose weight before getting pregnant, since her BMI is over 35.They have decided to adopt a child instead.