|Question 21Verbal

Source Texts

Text
With their distinctive cone shapes and steeply sloping sides, the volcanoes Mount Taranaki (New Zealand) and Mount Shishaldin (Alaska) may look similar from afar.        volcanologists classify them differently based on how they formed: Taranaki is a stratovolcano, while Shishaldin is a cinder cone volcano.
Which choice completes the text with the most logical transition?
Therefore,
A
However,
B
For example,
C
In addition,
D