Answer:
I do believe your answer is D: Most of Earth's mantle is always moving.
Hopefully this helped! :D
No, It does not have a fragment.
D) Arsat and his brother run away with Diamelen.
Sunny~ ☺
The correct answer is option D.
Because there is a preposition where the noun completes the meaning of the sentence "Sitting <u>on</u> the porch"
On: being the preposition.