Answer:
The answer is option an
Explanation:
Option a which is true is the answer. My opinion though. 
 
        
                    
             
        
        
        
Answer:
Expanding triplet repeats 
Explanation:
Expanding triplet repeats causes a disorder called Triple repeat disorder. It’s a genetic and dominantly inherited neurological disorder and is also classified as an unstable mutation.
Most of these disorders involve a CAG·CTG repeat expansion, such as Huntington disease etc.
 
        
             
        
        
        
Can you clarify the question
        
             
        
        
        
A because idn hope u find the answer
        
             
        
        
        
On the basis of inheritance, mutations are somatic or inherited. Inherited or genetic mutations are those mutations that occur in germ cells. These cells are inherited by the offspring from their parents as they are present in gametes. All cells of a multicellular organisms are made up of a single cell zygote.