【正确答案】 C

【答案解析】[解析] 原文第三段说“Jack became very worried about his walk in the park．He walked about the room several times and then sat down directly in front of the visitor and looked at him”(Jack很着急要去公园散步．它在房间里来回走了几次，然后干脆坐到客人面前，看着他)，我们得知Jack这么做是在催客人快走，答案[C]“ask him to leave”为正确答案。