Child death may occur in the marriage between

• A.  \[R{{h}^{+}}\]man and \[R{{h}^{+}}\]woman
• B.  \[R{{h}^{+}}\] man and \[R{{h}^{-}}\] woman  
• C.  \[R{{h}^{-}}\] man and R woman
• D.  \[R{{h}^{-}}\] man and \[R{{h}^{+}}\] woman