What is the primary meaning of the term crusade?

The term "crusade" primarily refers to a strong movement to advance a cause or idea, often with a sense of passion and commitment. This term originally relates to historical military expeditions in the Middle Ages aimed at reclaiming the Holy Land, but in modern usage, it has evolved to denote fervent campaigns advocating for social, political, or humanitarian issues. When someone is said to be on a crusade for a particular cause, it implies that they are actively and energetically working towards bringing about change or raising awareness, making option B the most accurate definition. This connection to dedicated advocacy makes the term powerful in social discourse, as it evokes a sense of urgency and importance around the cause being championed.