what is the relative ability of an organism to survive and produce fertile offspring?\na adaptation\nb…

what is the relative ability of an organism to survive and produce fertile offspring?\na adaptation\nb fitness\nc mutation\nd phenotype
Answer
Brief Explanations:
Fitness in biology is defined as the relative ability of an organism to survive and produce fertile offspring. Adaptation is a trait that helps an organism survive and reproduce. Mutation is a change in DNA. Phenotype is the observable traits of an organism.
Answer:
B. fitness