Anury Is the Absence or Abbreviation of the Tail in Sheep

Multiple Choice

Anury is the absence or abbreviation of the tail in sheep (and also other animals) .It is inherited in an autosomal dominant fashion.A ram with anury is mated to a ewe with a normal tail.The ram's father had anury,his mother did not.What is the probability that the ram and ewe will produce a lamb with anury? (ram = male;ewe = female)

A) 25%
B) 50%
C) 75%
D) 100%
E) No chance