• 1:1, 1.75:1, and 4:5
• 1:1 and 1.75:1 only
• 1:1 and 1.91:1 only
• 1:1, 1.91:1, and 4:5

The correct answer is: 1:1, 1.91:1, and 4:5

Explanation: When responding to the creative agency regarding accepted aspect ratios for image assets in an app campaign, you can provide the following information. Google accepts three supported aspect ratios: 1:1, 1.91:1, and 4:5. Each ratio has specific minimum dimensions for compliance. The aspect ratio 1:1 requires a minimum dimension of 200 x 200 pixels. The aspect ratio 1.91:1 requires a minimum dimension of 600 x 314 pixels. Lastly, the aspect ratio 4:5 requires a minimum dimension of 320 x 400 pixels. To assist with adopting these ratios, Google provides a new image cropper tool, simplifying and unifying the image and file size requirements across various app campaign types.