I Believe the answer is DNA so answer choice C
There are two primary methods of hard drive partitioning. The first method, employed in DOS, Microsoft Windows and Linux is Master Boot Record. The other method, used by more recent computers (after mid 2010) is the GUID Partition Table.
C.
A is incorrect because if they have the disease then they cannot be healthy.
B is incorrect because if the genetic disease is recessive then the cannot have the homozygous mutated gene because then it would mean that they are ill.
D is incorrect because having an offspring that is ill doesn't always guarantee that all the offspring will be ill. <span />