Weber believed humans could not be studied purely objectively because they were influenced by:
drugs
their culture
their genetic makeup
the researcher

The correct answer is B. Their culture

Explanation:

Max Weber was a German philosopher and sociologist mainly known for his ideas in social theory during the 19th and 20th century that were key for the development of sociology, because of this Weber is often considered as one of the founders of sociology along with Marx and Durkheim. In terms of society, Weber wrote multiple words that dealt with politics, religion and economy in different context and in terms of social research Weber stated individual and societies could not be researched in the same way of other subjects, mainly because they were influenced by their culture, indeed Weber believed positive or objective methods could not be applied in studying human societies and in any case the culture of individuals needed to be considered as this influenced their  behavior. Therefore, Wever believed humans could not be studied purely objectively mainly because they were influenced by their culture.