Which of the following is a valid aspect ratio for a portrait video?

• A. 16:9
• B. 9:16
• C. 2:3
• D. 1:1

Answer: (C)

Portrait video uses a vertical frame, so the height must be greater than the width. An aspect ratio expresses width to height; 2:3 means the width is 2 units and the height is 3 units, which makes it a portrait orientation. This ratio is a common vertical format in video production and works well on mobile screens, providing more vertical content than landscape or square formats. The other options yield landscape or square frames, which do not fit portrait viewing. The 9:16 ratio is also portrait, but 2:3 is a widely used alternative that many editing pipelines readily support.