The correct option is
D All of the above
Pursuing a career in biology can be immensely rewarding and exciting. Studying biology teaches us to ask questions, make observations, evaluate evidence, and solve problems.
In general, there are several career paths you can follow as a biologist, including:
Research- Research biologists study the natural world, using the latest scientific tools and techniques in both laboratory settings and the natural environment, to understand how living systems work. Many work in exotic locations around the world, and what they discover increases our understanding of biology and may be put to practical use to find solutions to specific problems.
Health care: Biologists may develop public health campaigns to defeat illnesses such as tuberculosis, AIDS, cancer and heart disease. Others work to prevent the spread of rare, deadly diseases, such as the now infamous Ebola virus. Veterinarians tend to sick and injured animals, and doctors, dentists, nurses, and other health care professionals maintain the general health and well being of their patients.
Environmental management and conservation: Biologists in management and conservation careers are interested in solving environmental problems and conserving the natural world for future generations. Park rangers protect state and national parks, help preserve their natural resources, and educate the general public. Zoo and aquarium biologists carry out endangered species recovery programs and serve as a vital education conduit to the general public. In addition, management and conservation biologists often work with members of a community such as landowners and special interest groups to develop and implement management plans.