The process where the organism with the best traits survives and passes on its DNA is: Evolution

Adaptation

Natural Selection

Variation

Natural selection :) In simple terms in the one with the best traits will repopulate so they can have the best traits the individuals who are weak typically die off and no one breeds with them :)

NATURAL SELECTION
according to charles darwin, organisms that possess heritable traits are more likely to adapt to new environments much more quicker and survive to pass their traits on to their offsprings

C- a hypothesis or d- an observation