The Genitive Case example is:
His dinner
Dinner of the dog
Dog's dinner
It means that we can replace or change the word with his, her or it at the beginning of the sentence.
The correct variant is D) Charles Dicken's books are very interesting.
His books are very interesting.
Books of Charles Dickens are very interesting.
Tourists from different countries are riding the London Eye.
Tourists from different countries are sitting on the bench inside the capsule.
Tourists from different countries are seeing London from above.
Tourists from different countries are laughing loudly
Tourists from different countries are taking photos of London.
Tourists from different countries are listening to music.
Tourists from different countries are shooting a video.
Tourists from different countries are talking on a mobile phone.
Tourists from different countries are enjoying the trip
D)charles dicken's books are very interesting