Answer:
"As you might expect, the national language of Japan is Japanese.
Explanation:
It is between the "expect" and "the national." Without it, it would be a run-on sentence and would sound drawn out, and the reader would likely run out of breath before finishing the sentence. Hope this helps!
I am pretty sure that it is b
Simile. In the sentence "Shining like a cascade of brown waters" It compared her hair to water and used the word "like"