Which of the following is a sign that customers are having trouble using a particular device to make purchases?

Analytics shows you have a lot of mobile visitors, but very few purchases through mobile
A specific product is not selling much compared to your other products
You get a lot of questions about your return policy
People are having trouble using a promo code for a current sale

The correct answer is:

Analytics shows you have a lot of mobile visitors, but very few purchases through mobile.