Warby Parker, an online retailer for prescription eyewear, offers a free, try-on at home program for its customers. Customers browse frames on Warby Parker's website and select five pairs they would like to try on. They can then choose to purchase or return the frames. Warby Parker handles all the shipping costs and provides all the return packaging. This relates to the of its products.

trialability

Explanation:

Since in the given situation it is mentioned that an online retailer offers for free try for his customers and the customers select five pairs theywant to try. Also they could select either for purchase or return

So here it related to the trail of its products where the customer could see whether the company product provide the satisfaction or not and according to this they take the decision whether to purchase the product or not

Hence, the last option is correct

im confused need to go into details plz thx