The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The social change during the eighteenth century that helped to increase the popularity of novels such as the life and adventures of Robinson Crusoe was the increased numbers of people who learned how to write and read, who had access to education, and started to show an increased interest in books and newspapers. This social change helped the print and publishing industries to grow, This turned into more books sold and the spread of new books published across Europe and other nations.
Another important factor was that during this period, some people started to have more leisure time and dedicated this time to read books. More readers with more time available meant more printed books to be sold.