According to the PSPO II resources, a product owner should optimize the value of the product and the work of the Scrum Team1.One way to do this is to improve the value experienced by the customer, which is the perception and evaluation of the product by the customer2.A price increase can be justified if the customer perceives that the product delivers more value than the cost3.This can be achieved by enhancing the product quality, functionality, usability, or design, or by providing additional benefits or services to the customer4. The other options are not effective ways to justify a price increase, as they may either reduce the value experienced by the customer, or increase the cost without increasing the value.Reference:

1:The Scrum Guide

2:User Experience

3:Value-Based Pricing

4:8 Techniques to Justify a Price Increase

:Justification for a Price Increase: Positioning For Success