Which researcher investigated the relationship between testosterone levels and maternal ambition?

The correct answer pertains to the research conducted by Deady, who examined the relationship between testosterone levels and maternal ambition. Deady's studies contribute to the understanding of how hormonal influences can affect psychological traits and behaviors, particularly in how maternal instincts and ambitions may be shaped by biological factors like testosterone. This line of research provides insights into the interplay between hormones and the psychological motivations that drive individuals, especially women in maternal roles.

The other researchers mentioned are recognized for different areas of focus. Buss is known for his work in evolutionary psychology, exploring human mating strategies and sexual selection. Harlow is famous for his experiments on attachment and social development in rhesus monkeys, while Skinner is best known for his contributions to behaviorism and operant conditioning. Each of these researchers made significant impacts in their respective fields, but none specifically investigated the relationship between testosterone levels and maternal ambition like Deady did.