Which one of the following is a work attributed to playwright Bhasa?

Bhasa was an ancient Sanskrit playwright, considered one of the earliest. Thirteen plays attributed to him were discovered in Kerala in 1912 by Mahamahopadhyaya T. Ganapati Sastri. Among his well-known works are Swapnavasavadattam, Pratijnayaugandharayanam, Pancharatra, Urubhanga, Karnabhara, Dutavakya, and Madhyama-vyayoga. Kavyalankara is a treatise on poetics by Bhamaha. Natyashastra is the treatise on dramaturgy by Bharata Muni. Mahabhashya is Patanjali's commentary on Panini's grammar. Hence Madhyama-vyayoga is the correct work attributed to Bhasa.