Correct Answer:
C. Capacitive
The correct answer is Capacitive. Capacitive touchscreens are the technology used in modern smartphones and tablets to identify multiple simultaneous touches (multi‑touch). A capacitive screen works by sensing the electrical properties of the human body. When a finger touches the screen, it distorts the screen's electrostatic field, and the device can detect multiple points of contact simultaneously. Optical touchscreens use light beams, magnetic screens are rare, and none of these are the standard technology for multi‑touch. Therefore, Capacitive is the correct answer.