Answer:
c)The same group of individuals exhibits a corresponding base-pair substitution in the DNA.
Step-by-step explanation:
Heredity is a biological phenomenon extremely linked to genetics. This process is characterized by the transmission of genetic information between parents and children, through reproduction.
This genetic information is transmitted through DNA. For this reason, some genetic errors that cause diseases and mutations are passed on to the same person in a family, since they all have extremely similar DNA.
For this reason, we can say that in relation to the question above, the researcher can conclude that the disease is hereditary when the same group of individuals exhibits a corresponding base pair replacement in DNA.