Explanation: According to the Salesforce Lightning Design System, the minimum touch screen target size for interactive elements on mobile devices is 44 pixels wide x 44 pixels tall. This size ensures that users can easily tap the elements without accidentally hitting the wrong ones or missing them entirely. The touch target size also takes into account the average finger size and the device resolution. Smaller touch targets may cause frustration and errors for users, especially those with low vision, motor impairments, or large fingers.