First of all, it is a change, not a charge.
Phenotype is physical manifestation of gene(physical), not a change, so it is not phenotype.
Variation is a state of being genetically diverse, but it is not a change, therefore it is not variation.
Genetics is the name of a field, and it is not a change.
Adaption are changes of a population overtime, through natural selection.
It is adaptions