The path to conversion on mobile is not the same as on desktop or tablet due to ALL of the following EXCEPT:
Differing screen size
The correct answer is:
User’s intent is not depended on a device they are using, while context, functionality and screen sizes differ.
Mobile has increased opportunities your customers have to reach out to you or a competitor. In turn, new opportunities have opened up for conversion. But because of the different screen size, functionality, and context, the path to conversion on mobile isn’t identical to that on a desktop or tablet. A mobile conversion doesn’t necessarily entail filling an online shopping cart and checking out.
Read more here: https://support.google.com/partners/answer/6208416