Which scientist proposed the idea of studying humans as groups rather than as individuals?

a. lamarck
b. darwin
c. malthus
d. linnaeus

Lamarck believed that an organism can pass on characteristics that it has acquired during its lifetime to its children.According to Lamarck, organisms altered their behavior in response to environmental change
Darwin noticed similarities among species all over the globe, along with variations based on specific locations,and he believed that they had gradually evolved from common ancestors. 
Malthius proposed a systematic theory of population. He believed that population growth is potentially exponential while the growth of the food supply is arithmetical at best.
Linnaeus is the father of Taxonomy.he classified, named and ranked the organisms.
So, Darwin proposed the idea of studying humans as groups rather than as individuals. (B)