Chinese of ten shake my hand and don't let go. They talk away contentedly, ______ of my discomfort and struggle to disengage my hand. A: oblivious B: patent C: obvious D: pernicious

Chinese often shake my hand and don't let go. They talk away contentedly, （）of my discomfort and struggle to disengage my hand． A: oblivious B: patent C: obvious D: pernicious