Mark Twin wrote many popular novels in his life, ________ The Adventures of Tom Sawyer is a best example. 
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A
of which
B
what
C
whose
D
which
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At present, we are studying a total of nine subjects, ________ I think is physics.
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A
of them the most difficult
B
and the most difficult of which
C
the most difficult of them
D
the most difficult of which
There are so many tall trees in the forest,______________.     
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A
some of them measures over 50 meters
B
some of which measuring over 50 meters
C
some of them measuring over 50 meters
D
some of which measures over 50 meters