Correct option is C
The assertion (A) is true as boys and girls tend to model their behavior based on the observed actions of same-sex adults, a concept explained by social learning theory. This theory emphasizes that individuals learn gender roles and behaviors through observation, imitation, and reinforcement within their environment, including family, media, and cultural practices.
The reason (R), however, is false because gender is not a purely biological construct. While biological differences such as chromosomes and hormones contribute to sex, gender is a complex social construct influenced by societal norms, cultural expectations, and individual identity. Gender roles and expectations vary significantly across cultures and time periods, highlighting their social rather than purely biological origins.