Run commands: cf=contfrac(pi,20), we can get ( )

A、 cf = [3, 7, 15, 1, 292, 1, 1, 1, 3, 1, 2, 1, 14, 2, 1, 1, 2, 2, 2, 2],;

B、 cf= [3, 7, 15, 1, 292, 1, 1, 1, 2, 1, 3, 1, 14, 3, 1, 1, 2, 2, 2, 2],;

C、 cf = [3, 7, 15, 1, 292, 1, 1, 1, 2, 1, 3, 1, 14, 2, 1, 1, 2, 2, 2, 2],;

D、


cf= [3, 7, 15, 1, 291, 1, 1, 1, 2, 1, 3, 1, 14, 2, 1, 1, 2, 2, 2, 2],