The most likely statement given the information about the population dynamics of the squirrels is:
A) The proportion of short-tailed squirrels may have decreased due to an increase in trees.
This is because long-tailed squirrels have a competitive advantage in jumping and balancing in trees, which likely allows them to be more successful in an environment with more trees. As a result, the proportion of short-tailed squirrels would decrease as long-tailed squirrels thrive in this enhanced habitat.