Answer: Option d Species A are more prone to extinction.
Step-by-step explanation:
The difference between the DNA sequences amongst the individuals living in a population is defined as the genetic variation. The genetic variations allows the individuals to adapt to different environmental conditions and hence, increases the survival chances of a particular species.
Since, species A have fewer genetic variations, it is more prone to extinction in case of any sudden environmental change because decreased genetic variation leads to a lesser probability of survival of the individuals of a species.