Final answer:
The industrial era issue of excessive drinking among workers contributed to movements for workplace reform and holidays but is not the origin of an 'unofficial industrial era holiday.' None of the listed options—Labor Day, Oktoberfest, St. Patrick's Day, nor Boxing Day—were established directly because of excessive drinking.
Step-by-step explanation:
The excessive drinking among European and American workers in the industrial era led to high alcohol consumption on Sundays, the only day off for most workers. There isn't an official holiday that came directly from excessive drinking, but Labor Day, which is not the correct answer to your multiple-choice question, became an official holiday giving workers more time to spend outside of work, potentially impacting drinking habits. The correct answer to your multiple-choice question seems to be missing from the list, as the situation described does not pertain to the options given: Labor Day, Oktoberfest, St. Patrick's Day, nor Boxing Day saw their origin directly due to excessive drinking among workers.
Industrial reforms, including half workdays on Saturdays, were instituted in the hopes of reducing this problem by giving workers more time to recover before the work week. Furthermore, significant efforts from labor unions and middle-class reformers focused on temperance and prohibition, with mixed results in terms of reducing alcohol-related social problems.