The fable starts with the city mouse inviting the country mouse over. The country mouse agrees and travels with the other mouse back to the city. The city mouse shows all the food and luxury he has in his home such as flour and oatmeal. Both mice then are force to hide from people who are considered dangers. The country mouse chooses to Leave because he'd rather live with little resources than to live in constant danger.
A is the correct answer because you don't want all the supporting details, why would you put it into someone else's words, and the reader of your summary won't understand it if you put it into incomplete thoughts.
What i didn’t get you question!