Mashaal Masha
The number of dark spots that appear on the Sun, known as sunspots, can vary greatly. For example, there were about 180 sunspots in November 2001. ________ there were only about 2 sunspots in December 2008.

Which choice completes the text with the most logical transition?
Difficulty: Easy
A: 

In other words,

B: 

Similarly,

C: 

Therefore,

D: 

By comparison,

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