Answer: Option A
Variation : a change or slight difference in condition, amount, or level, typically within certain limits.
Display : put (something) in a prominent place in order that it may readily be seen.
Severance : the action of ending a connection or relationship.
Silence : complete absence of sound.
Mutation : the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes.
Synonym of Mutation is Variation