Metalloids are useful as semiconductors in modern electronics, like smartphones. Which feature of a smartphone is made possible by metalloids? A. touchscreen B. ability to vibrate C. small size D. long battery life

I think the correct answer from the choices listed above is option C. The feature of a smartphone that is made by metalloids would be the small size. Metalloids are used as semiconductors which can be in small sizes that makes phones handy. Hope this answers the question. Have a nice day.