Erythroblastosis foetalis is caused when :

Question

( A ) $Rh ^{+}$ female & $Rh^{–}$ male
( B ) $Rh ^{+}$ female & $Rh^{+}$ male
( C ) $Rh^{ –}$ female & $Rh^{+}$ male
( D ) $Rh ^{–}$ female & $Rh^{–}$ male .