This is a question regarding the Ramayana one of the two major Sanskrit epics of ancient India. Sugriva and Bali were powerful brothers at the kingdom of Kishkindha. During their second fight, Bali was killed by a golden arrow shot by Lord Rama.
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.
