because the water erodes the land it touches in the deforms the land
Vertical. Many rocks in mountainous areas can be vertical or even overturned.
C maybe she wanted to keep them safe
I don't know whether this was one of your options, but South Asia can be very well characterized as a Sub-continent.
In fact, it's is commonly referred to as "the Indian Subcontinent" or even simply "Subcontinent". One of the reason for a distinction of this part of the land is that it lies on a different tectonic plate.
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The correct answer is number two
