题目1单选题
下列各选项中函数在相应的自变量的趋向下是无穷小的是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/1f5b73f3506d7675e9623f1795a1756d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/94d8198fd25ab28eb48d7f4c3dc0af5a.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/4a180be7040726cc28463e43a01c0fad.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/137a103a34c20caa4fa9472d1e75476d.png">