Final answer:
Good sportsmanship in sports, according to functionalist theory, primarily enhances social cohesion by expressing societal values of fair play and mutual respect, thus contributing to societal stability.
Step-by-step explanation:
According to the functionalist theory of sports, learning good sportsmanship fulfills the function of enhancing social cohesion. Functionalism views social institutions, including sports, as mechanisms for maintaining societal stability and order. Good sportsmanship is an expression of social values that emphasize fair play, respect for opponents, and the ability to win or lose graciously. By learning and adhering to these values, individuals contribute to the stability and cohesion of their social groups and society at large.
Sports also serve the purposes of providing entertainment and promoting individual achievement, which are additional functions of sports recognized by functionalism. However, as it directly pertains to learning good sportsmanship, the primary function served is enhancing social cohesion, making option b) the correct answer to the student's query.