The correct option is B Hemchandra acharya
Siddhraj Jaisinh requested to Acharya Hemchandra to write a grammar superior tp that of Bhoj. With in a year Hemchandra Acharya wrote an exhaustive volume of Grammar entitled Siddhemchandra Shabdanushashan containing one lakh and twenty five thousand shlokas covering the grammar of Prakrit and Apabhramsha languages as well.