An example(s) that illustrate(s) natural selection acting on behavioral traits that benefit individuals include(s)

Question

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All of the given examples illustrate natural selection acting on behavioral traits that benefit individuals. 
A) The effect of oxytocin on vole reproductive behavior: Studies have shown that the release of oxytocin during mating increases the likelihood of pair bonding between male and female voles. This behavior benefits the individuals as it promotes the formation of long-term monogamous relationships, which increases the chances of survival and successful offspring rearing.
B) The different responses of young coastal and inland garter snakes to banana slugs: Coastal garter snakes have evolved a stronger sensitivity to the toxins present in banana slugs compared to inland garter snakes. This allows them to avoid consuming these potentially harmful prey items, increasing their chances of survival.
C) Courtship behavior in sage grouses: Male sage grouses perform a complex courtship display to attract and mate with females. The males that display the most elaborate and vigorous performances are more likely to be chosen as mates by females. This behavior benefits the males as it increases their reproductive success.
D) The nest-decorating behavior of starlings: Starlings decorate their nests with colorful items, such as flowers and bits of plastic, as a form of sexual display to attract mates. Males that have more elaborate and attractive nests are more likely to be chosen as mates by females. This behavior benefits the males as it increases their reproductive success.

An Example(s) That Illustrate(s) Natural Selection Acting on Behavioral Traits