<span>An oceanographer would be most likely to study how whales are affected by pollution. An Oceanographer is a scientist that studies all aspects,physical and biological that pertain to the ocean. The topic of whales and pollution can fit under the study of ocean ecosystem dynamics which falls under the large umbrella of oceanography.</span>
A hydrologist can be defined as the person who researches the circulation, distribution and the properties (physical) of the water (underground and surface). A toxicologist is responsible for the study of the effects of various chemicals, drugs, or medicines on the body of an organism. An ecologist studies the distribution, abundance, and relationship of the different organisms and the environment of an ecosystem. An oceanographer studies the marine life, seafloor geology, plate tectonics and other properties of the ocean. an oceanographer will be responsible for the study of the effect of pollution on the whales.
Hence, the correct answer is 'Option D - Oceanographer'.
