Final answer:
Biological anthropologists study a variety of human-related biological aspects but do not typically study ancient languages, which falls under linguistic anthropology.
Step-by-step explanation:
Biological anthropologists study a wide range of topics related to human evolution, diversity, and biology. While they do engage in studies on human genetics, human biological plasticity, and human evolution, their focus on languages is different. Biological anthropologists may consider language in the context of human cognitive development and as part of the cultural aspects of our species, but they do not specifically study ancient languages as their primary focus. That area is more within the scope of linguistic anthropology or other fields that focus on language history and development.
The student's question concerns which of the listed options is not a typical subject of study for biological anthropologists. Given the information provided and the nature of biological anthropology, which includes the study of human genetics (A), human biological plasticity (C), primates (D), and human evolution (E), we can determine that the correct answer to the student's question is B Ancient Languages, which is generally not examined by biological anthropologists.