An abandoned field starts out with grass as the only plant species. After a few years, trees start to grow in the field. How will the trees most likely impact the biodiversity of the abandoned field?
A. The number of plant species will decrease, and the number of animal species will increase.
B. The number of plant species and the number of animal species will both increase.
C. The number of plant species and the number of animal species will both decrease.
D. The number of plant species will increase, and the number of animal species will decrease.