Answer: I read the book Red Queen by Victoria Aveyard. The most interesting character is Maven, the 2nd prince. He is supposed to marry Mare, and he supports her in every way possible. However, it is revealed he was never on her side at all at the end. He then frames her and his brother for his father's, the king's death.
Explanation:
From the definition of absolute phrases we know that it is a modifier that attaches to a sentence without a conjunctution. So, we can say "his chubby legs, pumping" is the correct answer.