B. possibility of identity theft
This one can be solved by process of elimination. Products online will likely be cheaper as companies don't have to factor in costs such as rent, employees, etc. that would be related to brick-and-mortar stores. Online stores will also likely have more options because they don't have to worry about ordering new/more stock. Lastly, if there's an issue with the product, she would likely be able to return the product by mail rather than traveling all the way to the manufacturer's unit.
However, Alexis could definitely fear the possibility of identity theft as the website she's purchasing the products on might not be secure and malicious people may steal her credit card information.