Select the option that will improve the underlined part of the sentence. In case no improvement is needed, select ‘No improvement’.
As we’ve been neighbours, I have known Mr. Robin since more than 10 years.

Point of time (কোন সময় থেকে শুরু) বুঝাতে since বসে।
- I’ve been swimming since I was three years old.

Period of time (কত সময় ধরে) বুঝাতে for বসে।
- She was waiting for four hours.
Not: She was waiting since four hours.

So, to improve the sentence we need to replace the underlined part with 'for more than 10 years'.