The correct option is C has/have been + the present participle [base verb + -ing]
A tense is a form of verb which provides details about the verb( time, progress, etc.) Option B)has/have been + the present participle [base verb + -ing] is correct as it is the structure of present perfect continuous tense. Thre other options are wrong as they don't provide a structure of the present perfect continuous tense. The correct answer is B)has/have been + the present participle [base verb + -ing].