【正确答案】 A

【答案解析】[解析] 他们愿意为了自己的信仰牺牲生命。句中be ready to do sth：愿意做某事。be willing to do sth：愿意做某事，如：They are willing to come．他们愿意来。be going to do sth：打算做某事，如：I am going to sleep．我打算去睡觉了。be pleased to do sth：很高兴做某事，如：Your father has told me of your success, and I am very pleased about it．你父亲告诉我你成功了，对此我很高兴。be reluctant to do sth：勉强，不愿意做某事，如：She was reluctant to give her money away．她不愿意把钱送给别人。只有willing意思上和ready最接近。