Read the following text and circle the best answer among A, B, C, or D on your answer sheet for the questions from 39 to 43

      As customers choose brands based on how they make them feel, rather than their actual products or services, there is an intrinsic advantage to those organizations who use designed experiences as a weapon to cut through the most competitive of markets. Those that don't, operate in what we call the "experience gap”, the space between them and their customer's expectation of them. Make no mistake, in our high paced and digitally connected economies, the experience gap is driving markets, fast. 

      For example, take Instagram and Twitter. These brands filled the demand for a whole new human experience that did not exist before the evolution of digital technologies enabled that. They were pioneers, and there were no established players to unseat. But we are also seeing a similar dynamic in existing industries. New entrants are coming in and taking the space, also using whole new experiences, purely because the incumbents left the door open. 

      Closer to home, this can be seen with Australian neobanks who are giving customers a better experience than the incumbents. Robert Bell is the CEO at neobank 86400. He says banking has already become quite complicated and he wanted to make a change. His neobank is working to solve customers' problems more holistically. Bell said, “It's significantly harder work and takes more time to become a bank, but having done that we can have a much better relationship with our customers and we can offer them a lot more products and services." 

      Think about that for a moment. Do you notice how better experiences, leads to better relationships, which is then the stepping stone for more offerings? Many brands still jump straight to modified offerings, without gaining that customer connection and the necessary foundation of trust first. 

(source: https://which-50.com/)

What does the phrase "stepping stone" in paragraph 4 mean?