You should tell your friends _________ with a ball in the street. It's too dangerous. [ ]

A. don't play

B. not play

C. not to play

D. to play

甲在乙经营的酒店进餐时饮酒过度，离去时拒付餐费，乙不知甲的身份和去向。甲酒醒后回酒店欲取回遗忘的外衣，乙以甲未付餐费为由拒绝交还。对乙的行为应定性为( )。

A．是行使同时履行抗辩权

B．是行使不安抗辩权

C．是自助行为

D．是侵权行为