Какое слово/фраза в данном предложении может в определении степени сравнения прилагательного?

10 kilometers is (far) distance I’ve ever walked.

Выберите один ответ:
a. В данном предложении на степень сравнения указывает фраза 10 kilometers
b. В данном предложении на степень сравнения указывает фраза I’ve ever walked.

So,from my point of view after school i want to study in university,because,it is helpful,intresting to know about new things,new new rulls,so cool!I want to study english language,sincere.and information of computer.I love this subjects because,in school i have of all them mark five.I think everyone must study all the subjects in the school,because in the future it will help you to how live,know another infornmation,or just help to your sister or brother to do lessons.It is so so good from my point of view!

-Where would you like to live in? 
-I would like to live in London.
-Oh, it's a very nice city, but why?
-Because, as for me, it's the most beautiful city within its own climate which I like very much. Rainy days calms me. In my opinion, London has the most picturesque places from the whole world, such as Buckingham Palace, The London Eye, Piccadilly street, and so on. But what about you? In what city would you like to live in? 
-Most of all, I like Paris, because for many people it is the most romantic city. Its streets are filled with sensibility and elegance. And it also has famous symbols, as Eiffel Tower, Notre-Dame Cathedral, Louvre Museum, and so on. It's the dream of my life.