A general rule of natural selection is that only the fittest survive. This does not necessarily mean that the strongest or the largest will survive.
It means that those that are best adapted to a specific environment will survive, for example, in a snowy environment certain animals will be the fittest, but in a jungle environment, the fittest will be others.
Another important rule is that natural selection selects the fittest not only to survive but to leave offspring and therefore perpetuate the genes suitable for a specific environment.
Therefore, the answer would be D (the most likely to survive are those who better adapt to a specific environment leaving offspring)