Which key is used to draw a perfectly horizontal line while dragging in Photoshop?

• A. Alt key
• B. Shift key
• C. Ctrl key
• D. Spacebar

Answer: (B)

When you want to draw a straight line in Photoshop, you can lock the angle with a modifier key. Holding the Shift key while you drag makes the line stay straight, so a drag that starts near horizontal ends up perfectly horizontal. This constraint also applies to other straight-line directions, letting you avoid any wobbly freehand movement. Other keys serve different tasks—like the Spacebar, which moves the canvas rather than drawing—so they don’t enforce the horizontal alignment you’re aiming for.