Question: Why is it problematic to define sizes using pixels on Android?

1. Although screen pixel density varies, this does not impact the use of pixels to define sizes.
2. Large devices always have more pixels, so your UI elements will be e=affected if you define them with pixels.
3. The same number of pixels may correspond to different physical sizes, affecting the appearance of your UI elements.
4. Different devices have different understanding of what a pixel is , affecting the appearance of your UI elements

Answer: The correct answer of the above question is Option C:The same number of pixels may correspond to different physical sizes, affecting the appearance of your UI elements.