Why is it more difficult to study the evolution of behaviour compared to studying the evolution of physical traits

A)  Behaviours may occur infrequently and may not last very long. 
B)  Natural selection generally does not operate on behaviours. 
C)  Behaviours are more susceptible to genetic drift. 
D)  Behaviours tend to evolve more slowly.

Evolution of Behaviour

The study of how and why animal and human behaviors change over generations through the principles of natural selection and genetics.

Genetic Drift

A mechanism of evolution caused by random changes in the frequency of alleles within a population over time.

Natural Selection

The evolutionary process where organisms with traits that enhance survival and reproduction are more likely to pass on their genes to the next generation.