User Stories in the Product Backlog should correspond to the INVEST acronym. Among other things, they should be independent of each other. What is the best explanation with which you would try to convince a new Product Owner of the meaningfulness of this requirement?

a) The closer the individual User Stories are intertwined, the more difficult it becomes for the development team to implement them.
b) Closely intertwined User Stories indicate a poorly structured Product Backlog.
c) Tightly intertwined User Stories are usually difficult to understand for the development team.
d) Tightly intertwined User Stories complicate the estimation of the individual User Stories and make prioritisation impossible in extreme cases. The latter is particularly disadvantageous if the User Stories in the Product Backlog are to be prioritised according to their benefits in order to achieve the best possible Return on Investment (ROI).