Answer:
Dr. Hendricks is most likely a proponent of the biological approach.
Explanation:
The biological approach basically suggests that gender and sex are not distinguishable from each other. Gendered behavior would be a result of biological sex; sex, in its turn, is a result of chromosomes and hormones, especially testosterone and estrogen - male and female, respectively. As we can see, Dr. Hendricks believes differences between the genders are due to differences in hormonal levels. It is safe to say Dr. Hendricks is a proponent of the biological approach.