В тексте упоминаются следующие причины употребления кофе: "Instead, they drink coffee to get going. Many people drink coffee in the morning to help them wake up. Others will also drink coffee during short breaks in the afternoon to keep going through the work day." Потеря веса (lose weight) или подготовка ума (prepare their minds for the day) не упоминаются как причины употребления кофе.
Ответ: a. To lose weight