Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
LONDON LANDMARKS
Millions of people visit London every year from all (1) ______ the world. If you travel there, you'll find many (2) ______ things to see and do. During August and September, you can visit Buckingham (3) ______. That's where the queen lives most of the year. It has about 600 (4) ______, but you'll see only state rooms where the queen entertains guests. In the morning, a colorful ceremony (5) ______ “changing of the guard” takes place in the palace courtyard. One group of palace guards (6) ______ off duty, and another troop arrives to replace them.

Millions of people visit London every year from all (1) ______ the world.