The answer is "c. late-onset alcoholism".
Most older adults with drinking issues start drinking in youthfulness or early adulthood and keep on drinking for the duration of their lives. In any case, an expected 33% of more established drunkards drink sensibly, with some restraint, until later life when separate, widowhood, despondency, weariness, monetary issues, depression, sadness, loss of reason, unending torment or sick wellbeing constrain an adjustment in drinking propensities.