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甲公司与乙公司约定，由甲公司向乙公司交付1吨药材，乙公司付款100万元。乙公司将药材转卖给丙公司，并约定由甲公司向丙公司交付，丙公司收货后3日内应向乙支付价款120万元。张某以自有汽车为乙公司的债权提供抵押担保，未办理抵押登记。抵押合同约定：“在丙公司不付款时，乙公司有权就出卖该汽车的价款清偿自己的债权。”李某为这笔货款出具担保函：“在丙公司不付款时，由李某承担保证责任”。丙公司收到药材后未依约向乙公司支付120万元，乙公司向张某主张实现抵押权，同时要求李某承担保证责任。张某见状，便将其汽车赠与刘某。刘某将该汽车作为出资，与钱某设立丁酒店有限责任公司，并办理完出资手续。丁公司员工方某驾驶该车接送酒店客人时，为躲避一辆逆行摩托车，将行人赵某撞伤。方某自行决定以丁公司名义将该车放在戊公司维修，为获得维修费的八折优惠，方某以其名义在与戊公司相关的庚公司为该车购买一套全新坐垫。汽车修好后，方某将车取走交丁公司投入运营。戊公司要求丁公司支付维修费，否则对汽车行使留置权，丁公司回函请宽限一周。庚公司要求丁公司支付坐垫费，丁公司拒绝。请回答第(1)—(6)题。关于乙公司与丙公司签订合同的效力，下列表述正确的是：

A. 效力待定
B. 为甲公司设定义务的约定无效
C. 有效
D. 无效

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