Answer:
Option E, leaves more viable offspring than others of its species
Step-by-step explanation:
A fit species is one that is able to survive in adverse conditions when most of its other mates fail to do so.
The species which is strong and viable enough to feed itself and reproduce successfully emerge as a fit species. Likewise, the offspring of fit species are viable and fit enough to survive, feed themselves and further reproduce successfully.
Hence, option E is correct