Answer: Risk barrier
Explanation:
With every new product or innovation, there is a risk that things will not work well. This risk is divided into 4 types;
The customer is facing a Physical risk barrier when she encountered the new product. As it has not been tried and tested by others, using it as a pioneer means that she will not know what she is getting into and so she worries that there is a chance it will harm her physically and make her ill.