Correct option is A
Ashtachhap refers to a group of eight poet-devotees of Lord Krishna associated with the Pushtimarg tradition.
It was founded by Shri Vitthalnath (also known as Vitthalesh or Gusainji), the son of Vallabhacharya, who founded the Pushtimarg sect.
Members of Ashtachhap included:
Surdas,Kumbhandas,Nanddas,Parmananddas,Krishna Das,Chaturbhuj Das,Govind Swami,Chitswami
Though Surdas and Kumbhandas were members, the group itself was organized by Vitthalnath.