Final answer:
A law-abiding citizen would fall into Robert Merton's conformity category within his strain theory, which involves adhering to societal norms and laws to achieve socially accepted goals.
Step-by-step explanation:
A law-abiding citizen who follows the rules and works within the system to achieve socially accepted goals would fall into Robert Merton's conformity category according to his strain theory. Merton’s strain theory suggests that society puts pressure on individuals to achieve a certain standard, such as the 'American Dream', but not everyone has equal means to achieve it. Those who conform have the goals and the socially acceptable means to reach them, which typically include following laws and adhering to societal norms. This category contrasts with others that Merton described, where individuals may innovate, rebel, retreat, or ritualistically adhere to the rules without striving for the goals.