当x→0时，下列是无穷小量的是（）

• A.<img src="https://timg.fentiku.com/javaimportItems/5b0239528f8043f0a36d41d713e18afa/images/9702f.jpg"><br/>
• B.<img src="https://timg.fentiku.com/javaimportItems/5b0239528f8043f0a36d41d713e18afa/images/9750c.jpg"><br/>
• C.<img src="https://timg.fentiku.com/javaimportItems/5b0239528f8043f0a36d41d713e18afa/images/979e9.png"><br/>
• D.<img src="https://timg.fentiku.com/javaimportItems/5b0239528f8043f0a36d41d713e18afa/images/97c58.jpg"><br/>

正确答案：D