The word this in Paragraph 4 ("...this is because we have no "cuisine" ourselves...") refers to the fact that... 1. ...the British share their dishes with the world. 2. ...all the best food in Britain is foreign. 3. ...various foreign food is available in London. 4. ...there are a lot of immigrants in Britain.

The word this in Paragraph 4 ("...this is because we have no "cuisine" ourselves...") refers to the fact that... 1.  ...the British share their dishes with the world. 2.  ...all the best food in Britain is foreign. 3.  ...various foreign food is available in London. 4.  ...there are a lot of immigrants in Britain.